Integrated Production Control System

Bulletin 33G1A13-01E[Ed:02/b]

Subject to change without notice.All rights reserved. ©1997, Yokogawa Electric Corporation.

CONTENTSINTRODUCTIONSystem concept • • • • • • • • • • • • • • • • • • • • • • • • • 3Reliable technology • • • • • • • • • • • • • • • 5

SYSTEMSystem configuration • • • • • • • • • • • • • • • • • • • 7Wide-area communication and Fieldbus • • • 9

OPERATIONComprehensive ICS lineup • • • • • • • • • • • 11Operation panels • • • • • • • • • • • • • • • • • • • • • • 13Alarm and multimedia functions • • • • • • 15Management Information Function /CS Batch • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 17

CONTROLField control station configuration • • • 19FCS functions • • • • • • • • • • • • • • • • • • • • • • • • • • 21

FCS reliability • • • • • • • • • • • • • • • • • • • • • • • • • • 24

ENGINEERINGEngineering environment • • • • • • • • • • • • • 25Engineering abilities • • • • • • • • • • • • • • • • • • • 28

SOFTWAREExtensive software lineup • • • • • • • • • • • • • 29MAINTENANCESafeguarded system performance • • • • 31

SUPPORTField support operations • • • • • • • • • • • • • • 33

TRAININGComprehensive programs • • • • • • • • • • • • 35

SALES & SERVICE NETWORKYokogawa offices and agents • • • • • • • • 37

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Sets the Standards forTomorrow's Industry

System concept

The CENTUM CS Leads IndustrialStructural Change

Wide Applicability withMaximum FlexibilityA large production support system requiresan optimally-balanced configuration of sen-sors, operation equipment and control com-puters installed in the field. With its strongtrack record in implementing all types ofplant automation, Yokogawa has the know-how and expertise required to configure anyproduction support system.

CENTUM CS, the core of Yokogawa's inte-grated production control systems, controlsthe management of operations, production,facilities, safety, and plant environment. Itcan completely execute plant operations,management and control. CENTUM CS isperfectly suited to plants in any field - refining,chemical or petrochemical products, iron andsteel, nonmetal and ceramic, pulp and paper,food, pharmaceutical products, electricpower, gas and oil, water and wastewater,textile, or any state-of-the-art factory.

3 4

Flexibility - Four Basic Concepts

■ Innovative integrationCENTUM CS offers innovative integration to cope with various plantautomation requirements - for example, integration of instrument, electric,and computer systems; integration of process and factory automationsystems; integration of control-room interfaces; integration of locally as wellas globally distributed systems; and integration of CIM (computer integratedmanufacturing). CENTUM CS comprehensively offers optimal, innovativesolutions for your integration requirements.

■ Unified architectureStandardized interfaces with a wide variety of subsystems and softwarepackages, simplified system operation, and a unified engineering envi-ronment are essential in achieving a truly open system environment.CENTUM CS meets these requirements readily, while also providingmaximum flexibility for future expansion, with consistent reliability andfunctionality ensuring smooth system advancement well into the future.

■ Increased engineering efficiencyIn order to shorten the lead time between product development and pro-duction, engineering methods must be continuously refined. CENTUM CShas a wealth of field-proven application packages to meet this requirement.It also has exceptional engineering methods which have been standardizedin the open environment.

■ Life-cycle optimizationCENTUM CS is designed to optimize all costs involved in the setup,engineering, startup, maintenance, and safeguarding of your system.Moreover, your existing software, instrumentation and information systemcan all be effectively integrated in the new system. This helps optimize totalsystematization costs throughout the lifetime of the system.

Operation

management

Facil

itymanagement

Production management

Innovative

integration

Increased

engineering

efficiencyLife-cycle

optimization

Unified

architecture

Safety and

environment

management

CENTUM CS - Built on Highly Reliable,Refined Technologies

In 1975, the CENTUM system was intro-duced as the world's first distributed controlsystem, integrating control, computation andcommunication technologies. The systemhas never ceased developing since then. Unitoperator stations, redundant coprocessor sys-tems (CENTUM); functional human-inter-faces, voice output, sequence control sta-tions, user-oriented operation systems (CENTUM-V); integrated engineering func-tions, touch-sensitive control panels, multi-ple windows, integration (CENTUM-XL);and many other achievements highlight thesystem's development. Every advancementof the CENTUM system has always markedthe start of a new trend in the field.The system has been enhanced over time, but ithas always maintained compatibility withCENTUM system users' existing resources.This ensures maximum utilization of the

user's existing hardware, software, engineeringknow-how and data. Yokogawa's vision ofmaintaining continuity throughout thegrowth of a system is certainly reflected inthe CENTUM CS system. The CENTUM CS system features integratedoperation, open-network architecture, controlstations with RISC CPU (the first in theindustry), and other advanced functions. Thesystem permits overall improvement or reno-vation of your existing system. It alsopromises a smooth transition to future sys-tem advancement, supporting all sorts ofexisting resources. It is a worthwhile invest-ment that brings excellent results in opera-tion and maintenance throughout the lifecycle of the system. The CENTUM CS systemreflects the philosophy of Yokogawa, a leadingcompany in the field of distributed controlsystems.

5 6

Reliable technology

CENTUM CS, since 1993The most recognized achievements and expertise inthe field of distributed, analog, and digital controlsystems were brought together to develop the latestCENTUM CS system. Including console and desktopmodels, it offers a variety of human interfaces withconnectivity to existing CENTUM systems as well assupervisory PCs. The result is maximum flexibility forexpansion with consistent reliability and perfor-mance. Operator and environmental needs havebeen carefully considered, providing unlimited possi-bility for progress in the field of control systems.

The CENTUM CS system complies with the fol-lowing international standards:CSA standard C22.2 No. 1010-1 (North America)CSA standard EN61010-1 (Europe)EMC standards (Europe)CENTUM-XL attracts attention in 1988

Advanced process control, electronic circuitry, com-munications, and human-machine interface tech-nologies were fully applied to this new CENTUMsystem. Its isolated engineering capability, multi-window function and other features made it a state-of-the-art control system, attracting considerable world-wide attention.

CENTUM-V raises standards in 1984The operator-friendly control station was introduced,further improving system reliability and simplifyingmaintenance, beginning a new trend in the age ofhigh-intensity industrialization.

CENTUM in 1981Duplexed control-station processor, power, andcommunications systems were introduced, greatlyimproving system reliability and safety.

CENTUM makes waves in 1975This was the first distributed control system in theworld, ushering in an era of full-fledged CRT-utilizingoperations. It marked a sensational breakthrough inthe field of then-prevalent analog instrumentationsystems.

Yokogawa's Capability and Years of Expertise Reflected inPast and Present CENTUM Systems

ICS (Information and Command Station)The ICS is a high-performance human-interface used forcontrol and monitoring of plant operations. It does thisby gathering all of the required information - process vari-ables, setpoints, measured values, control parameters,alarm status, etc. It can be equipped with engineering andsupervisory computer communication functions, offering anopen environment allowing expansion or upgrading, asrequired.■ Console ICSA standard ICS, renowned for its high performance andreliability.■ Desktop ICSA space-saving ICS, equipped with all of the functions of theconsole-type station.■ PICS (PC-based ICS)A new-generation ICS, utilizing a general-purpose com-puter that meets the needs of today and tomorrow.■ HICS (Workstation-based ICS)A high-performance ICS, utilizing a general-purposeworkstation.

System configuration

CENTUM CS - Flexible and Expandable

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System Integration for RationalizedProductionCENTUM CS has many integrating functions. Integrating thecontrol of instrument, electric, and factory automation sys-tems, along with control room functions and information.Control information via digital public networks can also beincluded. Therefore an entire system - from the supervisorysystem down to lower-level control systems containingfield equipment - can be easily configured into a network.

The strength of CENTUM CS lies in its ability to integrate theentire operational management of a plant. This results inmanpower-savings, total-automated plant operation, pro-viding improved product quality and yield. CENTUM CSprovides maximum flexibility in configuring systems forplants, regardless of their size, including connections toyour existing control systems (such as CENTUM-XL orµXL), permitting centralized operations from anInformation and Command Station (ICS). The unrestrictedsystem-configuration capability offers unprecedented andrational systematization of plants, big or small.

Console ICS

Console ICS

Console ICS

Printer

Hard-copyunit

ABC

ABC

V net

V net

E net

FCS

FCS

ACSNode

Communicationnode

PLC Node

Node

RIO bus

Optical fiber

Optical fiber

Fieldbus

Ethernet

Ethernet

ACG

ACG

Desktop ICS

Desktop ICS

HICS

PICS

EWS

EW

General-purposecomputer

RL bus

HF bus

EWS (Engineering Workstation)A workstation used for engineering operations.

FCS (Field Control Station)The FCS is the heart of CENTUM CS advanced controlfunctions. It is high reliability and supports both remote I/Ofunctions and Fieldbus.

ACS (Advanced Control Station)This station executes supervisory control of multiple fieldcontrol stations (FCS), and has advanced control algo-rithms for the execution of advanced control functions.

NodeThis is a remote I/O device providing communications forfield I/O with FCSs via RIO buses.

Communication NodeThis is a remote I/O device to handle large amounts ofdata transferred between subsystems and FCSs.

ACG (Communication Gateway Unit)This unit connects an EWS or supervisory computer with thesystem-control V net bus.

ABC (Bus Converter)This device provides connections between system-buses,integrating existing Yokogawa (CENTUM-V, CENTUM-XL) distributed control systems or other CENTUM CSsystems.

V netThis real-time system-control bus connecting allCENTUM CS stations together, providing quick and reliableresponse.

RIO busThis is a communications bus between remote I/O devicesand an FCS.

EthernetEthernet is an information LAN that connects higher-level

systems with ICSs, permitting the communication of datafiles and trend files.

E netThis is an information LAN within a system interconnectingmultiple ICSs or connecting EWSs.

FieldbusThis bus, which meets Foundation Fieldbus standards, per-mits digital communications for field equipment capable oftwo-way communication.

ACG

ACG

Router

Router

Digital public ordedicated network

FCS

PICS

PICS

General-purposecomputer

General-purposeworkstation

A Monitoring System forGlobally Integrated PlantOperationsPlants and factories located in different parts ofthe world can operate efficiently only if theyare linked together in a way that permits theintegrated application of all necessary oper-ating information.

The CENTUM CS offers a communicationfunction that uses digital public networkswhich easily support an integrated networkof plants and factories - regardless of loca-tion or time zone.

Cutting-edge Performanceof FieldbusCENTUM CS has been one of the first to useFieldbus, this represents a revolution in digitalcommunications, meeting FoundationFieldbus standards. The Fieldbus permitstwo-way communications for field equip-ment, thus enabling the networking of fieldinformation.

Fieldbus also ensures the high-speed trans-mission of large amounts of data, as well asinteractive operability between field devices.As a result, it can overcome the shortcom-ings of conventional communications meth-ods. Consequently Fieldbus contributesgreatly to the optimum configuration of inte-grated systems.

Yokogawa has played a leading role supportinginternational standards for the Fieldbus, rec-

ognizing the importance of establishingFieldbus technology in this age of digitalinstrumentation.

Advantages of FieldbusFewer cables:A number of field devices can be connected toa single cable with multiple-drop connection,making it possible to transmit multiple datavalues over one cable using a multi-sensingfunction.Improved transmission accuracy:Digital signals largely reduce data-transmissionerrors.Advanced communication capability:All types of data, other than process or mea-sured variables, can be transmitted bi-direc-tionally at high speeds. This means theinstallation of fewer cables.Secured interactive operability andoptimum system configuration:Interactive operability can be provided,regardless of field equipment manufacturer.This expands equipment availability, allow-ing optimum choices for your own type ofsystem configuration.Distributed control:Data exchange and control can be executedbetween field devices in the field, reducingthe load on the host computer.Integrated systems:Instrumentation, electrical, process, factoryautomation, building automation, officeautomation, and other systems can be freelyintegrated to ensure concentrated control andoperation.Easier failure diagnosis:Minute fluctuations in process variables can beprecisely measured and analyzed in time-series order, ensuring efficient diagnosis offailures.

10

Wide-area communication and Fieldbus

CENTUM CS Integrates Plants Around theWorld Into One Network

Fieldbus Technology Opens a New Age of DigitalInstrumentation

9

Bus-type wiring

Star-type wiring

ICS

FCS FCS

ICS

ICS ICS

ICS

V net

ACG

Router

FCSFCS FCS

V net

ACG ACGEWS

Router

Digital public switched ordedicated network

EWS

ACG

FCS

Fieldbus

● Fieldbus engineering● Field equipment management● Maintenance and diagnosis

Fieldbus

Field equipment

Field equipment

PC

A Full Lineup For Your OperationalRequirements

Easy-to-use OperatorStations with PowerfulFunctionsThe Information Command Station (ICS) isan operator-friendly interface to take com-mand of plant operations and monitoring.This powerful station supports the addition ofgraphic, database, and user C language func-tions. It also has an engineering function per-mitting generation and maintenance of CENTUM CS functions, and a function forcommunicating with supervisory computers.

Multi-platform for VersatileSetup and ApplicationThe ICS has multi-platform capability,allowing a variety of platforms to establishthe most comfortable work environment suitedfor your needs. The console ICS supportsmultiple setup. The desktop-type offersspace-saving compactness. The PC-basedPICS features quick and easy application,while the HICS converts your general-pur-pose workstation into a full-fledged ICS.

Human-interface Functions -User-friendly OperationsPerformance-proven operation panels andwindows are used to control powerful functionssimply. Touch panel control (console unit)and mouse operations freely permit windowdisplays. Motif, an industry-standardGraphical User Interface (GUI), enhancesthe engineering function with standardizeddisplay and operation. Display and opera-tion procedures have been standardized.

Multi-lingual conformity providedTag comments, operator guide and help mes-sages, and other information displayed onthe ICS CRT are available in the followinglanguages:● British English● Chinese, simplified ● Chinese, traditional ● Danish/Norwegian● French● German● Italian● Korean● Portuguese ● Russian● Spanish● Swedish/Finnish

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Comprehensive ICS lineup

Easy-to-operate KeyboardThe operational keyboard for any type of ICS (desktop,console, PC-based and workstation-based ICS) featuresfunctional layout and one-touch key operations. Allflat-top keyboards are dust- and water-resistant.

Fast, Mouse-only Operation(PICS, HICS)An innovation in keyboard-less operations. All "keys" aredisplayed in the system message section (PICS andHICS), to permit quick and simple operations usingonly the mouse.

Operational keyboard for console ICS

Operational keyboard for desktop ICS

Desktop ICSWith separate CPU, CRT, and keyboardunits, the desktop-type ICS fits perfectly in acentral or local control room, as well as inyour production control office.

Console ICSEquipped with single or dual stacked CRTs.Supports touch-panel, multimedia, and otheradvanced functions. The human-engineereddesign provides an ideal operation environ-ment.

PICS (PC-based ICS)A general-purpose personal computer can beequipped with the ICS functional software. Itcan be connected anywhere you desire youroffice or plant.

HICS (Workstation-based ICS)A general-purpose workstation easilyequipped with ICS functions for immediateapplication.

Humanly-engineered for Smooth, IntuitiveOperation

Multi-functional, Easy-to-read Panels Ensure EfficientOperationThe ICS displays a number of operation andmonitoring panels, which can be navigatedvia touch screen (console ICS), mouse,trackball or keyboard.

The use of windows on these multi-functionpanels expands their ability to implementmultimedia, computer-windowing, messageinvoking, and instrument-face plate viewingfunctions. Graphic calculations and user-application data processing are likewise sup-ported. All panels and windows offer easy-to-read, complete information, so ensure effi-cient control operation.

Multi-window FunctionNecessary information can be accessed withoutswitching panels, enabling quick control andmonitoring. Up to ten windows can beopened on one panel.

Half-size Panel FunctionThe operation panel displays information athalf size (one-quarter in area), permittingone CRT to display four times the volume ofinformation that conventional CRT unitscould. This greatly extends operation andmonitoring scope, while reducing the burdenon the operator.

Oversized Graphic PanelsGraphics panels can be displayed 4- or 1.5-times larger in area. They can also bescrolled, to select any section for quick view-ing.

Computer-windowing FunctionThe supervisory computer's display can beshown in a window on the ICS operationpanel.

Interaction with User-programsUser-programs can be installed and run inter-actively with the operation panel, to provide anadvanced operation and monitoring environ-ment. This permits the calculation and pro-cessing of displayed data, the retrieval, pro-cessing and displaying of filed data, plusmore.

Security FunctionOperator log-in and log-out can be restrictedfor each ICS, and allows for designation ofwhat each operator can perform at thelogged-in ICS. The operator's identificationand actions on the system are recorded,offering a full audit trail and strict securityfor every ICS in operation.

Two-step ActionThe ICS takes advantage of the two-stepaction principle, which is widely employedin electrical and other control fields. Two-step action enables efficient on/off switchcontrol of electric motors, pumps, compres-sors, conveyors and other devices, and controlof the operation of three-position controlledequipment. Just select the equipment'smotor or switch icon on the graphics panel -this lets you control its operation, as indicatedby the color of the icon.

Operation Panels - TheCenter of Overall PlantOperations

Graphics PanelThe flow of plant processing can be graphicallypresented, along with data, graphs, modi-fiers, and other displays. A dynamic displayfunction is available to create elaborate visualpanels for operation and monitoring.

Overview PanelUp to 32 display blocks can be assigned toindividual plant equipment units, making iteasy to monitor equipment status and overallplant operation. You can easily spot statuschanges and alarms, since the display blockschange color (red, yellow or green) or flashwhen they occur. The display blocks can bedeveloped quickly into related panels indi-cating required actions.

Control Group PanelThe status of up to eight function blocks can bedisplayed using instrument faceplates, per-mitting control and monitoring of their set-points, manipulated outputs, operation mode,and so on.

Tuning PanelInformation on each instrument's status canbe displayed in detail. The information -parameters, the instrument faceplate, andtuning trend graph - is used to modify set-points and other parameters.

Operator Guide Message PanelPre-installed guidance messages can be dis-played when requested by FCSs.

Alarm Summary PanelProcess alarms and annunciator messagesoriginating within an operation group ofICSs can be displayed in the order of occur-rence. Other important alarm messages canalso be displayed selectively.

Trend Group PanelThis panel lets you visually analyze datatrends by recording and displaying tag-datachanges in time-series order. The tag-datachanges from other ICS's can also be dis-played via the network.

13 14

Operation panels

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Alarm and multimedia functions

Extensive Functions Re-enforcingPlant Operations

Operation Status PanelsThe following panels display the currentplant control status:● Control drawing status panel● Logic chart status panel● Sequence table status panel● SFC status panel● SEBOL status panel

Industrial Television (ITV) cameras, largescreens, voice output, external I/Os and othercommercially available interfaces can beintegrated with the CENTUM CS ICS. Thismeans you can build a state-of-the-art multi-media system for rational plant operation andmonitoring.

ICS Panels Displayed on a LargeScreenThe ICS's high-resolution displays can beprojected on a large external screen, allow-

ing other operators to view the display andshare the information easily.

Connections to ITV Cameras forDirect SurveillanceITV cameras can be panned, tilted, orzoomed, and are extremely useful in moni-toring plant operations, once displayed onthe window. Real-time, moving views of theplant can be shown on the ICS screen - there isno need for a special monitor.

ICS Panels Displayed on Large Screens

ITV view shown in windowScreen 1 Screen 2

CRT-1 display signals

ITV1

ITV2

ITV controlsignals

ITV3

ITV4

Video signals

Image signals

AV controller

CRT1 CRT2

CRT-2 displaysignals (possibleeven when CRT-2not installed)

Multimedia-supporting Capability

Alarm Function Ensures Rapid Response

Process AlarmsWhenever a process alarm is triggered, theICS informs the operator in a number ofways: an alarm mark in the system-messagesection of the display appears; an electronicbuzzer sounds; a voice message is given; andthe key lamp blinks. The operator thenopens the alarm summary panel, overviewpanel or alarm window to easily obtaindetails on the cause of the alarm.

Hierarchical AlarmsAlarms are classified into five levels accordingto seriousness: high-priority, medium priority,low priority, logging, or reference. Lower-level alarms are suppressed when higher-level alarms are in effect, to allow promptattention to urgent alarms.

Auto-repeating AlarmsIf a high-priority alarm has not beenprocessed properly and status has notreturned to normal, the alarm is repeatedautomatically, following a default timecycle.

Operation GroupsMultiple ICSs can be assigned to a specificplant as an operation group. This arrange-ment shuts out alarms and messages fromoutside the group, avoiding unnecessary con-fusion.

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Control drawing status panel

Sequence table status panel

FCS ICS

Alarmprinted

Alarm filed

Alarm mark flashes LED flashes Electronic buzzer sounds

Alarm window Alarmsumma-ry panel

Overviewpanel

Process alarmoccurs

Alarm Recorded

Notification of alarm

Related panels

Complex Batch OperationsMade Easy

Yokogawa's RichExperience and AdvancedKnow-howWith its cutting-edge batch-control technologyand expertise exhibited over many years,Yokogawa has developed an ideal batch-control environment for easy operation andefficient engineering. The CS Batch, whichmeets ISA S88 standards, is a comprehen-sive batch process operation and manage-ment package designed for flexible applica-tion to lot-varied, multi-product production.

CS Batch Functions Meeting ISAS88 StandardsCS Batch can be connected freely and sim-ply to supervisory recipe and informationmanagement systems.

Program Languages To Suit thePurposeUnit procedures and sequences are writtenusing the SFC language. Unit-sequencephases use SEBOL, sequence tables, or logiccharts. The SFC status panel displays theprogress of sequence execution.

Recipe ManagementProduction equipment, procedures, methods,and parameters can be planned and editedusing the recipe creation panel.

Process ManagementThe unit procedure panel is used to manage theexecution of batch operations.

Unit SupervisionThe batch unit management function isapplicable to a wide range of operations,from operations at a batch plant to those at acontinuous process plant. Plant equipmentand instruments are conveniently groupedinto units for individual operation and con-trol, allowing instant reaction to any irregularity

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Management Information Function/CS Batch

ISA S88 batch control activity model

SFC status panel

Recipe creation panelUnit procedure panel

Function Outline

Powerful Functions for DynamicData-processing

Management InformationFunction (MIF)The MIF is an ICS data processing package.Process data from FCSs and historical data atthe ICS can be converted into spreadsheetsand charts for reference.

Long-term Trending FunctionLong-term trend data stored at the ICS canbe presented in chart form using the trendwindow, which shows long-term fluctuationtrends and interactive parametric relations inplant operations. Three chart formats areavailable:Pen plot graphUp to 32 pens can be used. A history ofalarms and messages can also be displayedin the window.Bar chart graphMeasured data can be presented in barcharts.Three-dimensional graphTemperature distribution data and other plantcondition data can be shown in relation tomeasured positions. Multiple sets of mea-sured data can be displayed in time-order, tosuit individual need.

Logging FunctionProcess, historical, and closing data can beedited into spreadsheets, indicating their tagnames, types, and processing procedures.The logging function then automaticallygathers the data, processes them, and dis-plays results in the spreadsheet in pre-deter-mined cells.

Statistical Quality Control (SQC)FunctionThis display tool converts the saved trenddata and displays them in the followingseven chart formats:X- - R management chartsThe mean value (X-) and dispersion range (R)of a production lot are displayed, makingquality control easier.X- - δ management chartsThe mean value (X- ) and dispersion deviation(δ) of a production lot are displayed, makingquality control easier. This is especially usefulfor large production volumes.Pareto chartThis chart shows the causes of productdefects, in order of seriousness.Scatter plotThis chart is ideal for showing interrelation-ships between two factors.

HistogramsThe distribution of measured values and theiroccurrence rate are shown in a bar chart.Pie chartsPie charts are used to show product composi-tion ratios, etc.Deviation totalization graphsDeviation values (the total of process target set-point values and measured values) are shownin a bar-segment graph. This is useful foranalyzing drift trends.

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Three-dimensional graphLogging display

Deviation totalization graph

Recipe management

Master recipe

Schedule management

Informationmanagement

Exterior interfacesProcess management

Unit supervision

Units

Control recipe

Procedures

Recipe procedure

Unit procedure 1

Unit procedures

Charge

Heating

Reaction

Discharge

Unit sequence

Initialization

Charge start

Charge end

UNIT 1 UNIT 2

Feed A•••

FIC100.LS="AUT"drive[Valve_1=on]

•••

end

Unit data

ModeStatus

Execution start timeBatch ID

User-defined dataOther

Unit procedure 2

Recipe manage-

Schedule management

Informationmanagement

Process management

Unit management

Process control(function block)

CS Batch

All Conceivable Functions AreIntegrated To Ensure Precision Control

A New-Generation Integrated Control

Station - Excellent Reliability and

Efficiency

Control stations must of course be extremelyreliable and efficient. Recognizing this,Yokogawa has developed a new-generationcontrol station integrating instrumentationcontrol (I), electric control (E), and computerfunctions (C). The new IEC-integrated controlstation draws on the proven reliability of the"pair-and-spare" design. The open yet highlyreliable system is complete with controlfunctions and hardware offering many exclu-sive features, while the installed open soft-ware implements robust security measures.

■ The proven "pair-and-spare" design ensures afault-tolerant system.■ The compact remote I/O unit has largelyreduced field-wiring costs and space.■ A complete lineup of available FCS's sup-port I/O signal points and application capacity.■ The application capacity can be freely dis-tributed, according to plant size.■ Block engineering, which integrates instru-mentation control and electric control, can beperformed.■ The batch control function meets ISA S88standards.

FCS Composed of FCU,Nodes and Connecting RIObusesField Control Unit (FCU)The FCU is the computing unit of the FCS. Itsprocess controller uses RISC chips to ensurehigh-speed processing and excellent func-tionality.

Node (Remote I/O Unit)Field I/O signals are connected to thisdevice. It converts and transmits the signals tothe FCU. The node is connected to the FCUvia a remote I/O (RIO) bus. It is composed ofan I/O unit connecting field signals or sub-systems, and a node interface unit for com-munications with the FCU.

I/O UnitThe I/O unit is composed of an I/O module anda supporting nest. The I/O module processesvarious field signals while communicatingwith the FCU.Analog I/O ModuleThis is a multi-functional module composed offour modules. It can be adapted to differentI/O signals by varying its capacity, usingsoftware. It is capable of ordinary lineariza-tion, square-root extraction, and special lin-earization processing. Each of the four mod-ules processes one group of signals in a com-pletely distributed configuration, ensuringhigh control-loop system efficiency.Multiplexer ModuleThe multiplexer module is employed toprocess multi-point I/O signals, and is wellsuited for monitoring and a simple controlloop.Contact I/O ModuleThis module has built-in compound actionfunctions, such as edge-detecting pulse inputcounting, variable pulse-width output, and

time ratio ON/OFF output, in addition to itsbasic status I/O processing function.Communications ModuleThe three communications modules (RS-232C, RS-422 and RS-485) are used to com-municate with various programmable logiccontrollers (PLCs) by downloading neces-sary protocols.Fieldbus Communications ModuleThis is an interface module for communicatingwith the Fieldbus.

RIO busThe RIO bus (Remote Input/Output Bus) is acommunications bus that can be made dual-redundant, connecting the FCU and the node.A repeater or optical repeater can be used forlong-distance transmission. Nodes can beadded to the RIO bus or changed withoutinterrupting the operation of the FCU orother nodes.

19 20

Field control station configuration

Field Control Unit (FCU)

Node interface unit

I/O units

I/O modules

ICS

FCU (Field Control

NodeInterfaceunit

Node(cabinetmounted)

Node (19"-rackmounted)

I/O unit

Communication unit

RIO bus

Optical repeater

V net

AnalogI/O

ContactI/O

RS-232CRS-422RS-485

(PLC=Programmable Logic Controller)

Subsystem

PLC, etc.

A Variety of Function Blocks forProgressive Upgrading

Function and FaceplateBlocks Support AdvancedInstrumentation andElectrical Control FunctionsVarious control function blocks and face-plate blocks can be linked freely and flexiblywith one another, providing advanced instru-mentation and electrical control functions forthe control station.

Function BlocksThe function blocks are the basic controlelements to configure a control system.They can be optionally combined to set up acontrol system that is most suitable for yourpurpose.Regulatory Control BlocksThese function blocks compute process data formonitoring and control. PID control, inputindicator, manual operation, signal selection,self-tuning, and other function blocks areavailable.Sequence Control BlocksThese function blocks control interlocking,process-monitoring, and other sequences oflooped equipment. Sequence tables, logiccharts, and other sequence description methodscan be used.Calculation BlocksThese function blocks assist regulatory andsequence control functions. Analog and con-tact signal computation, high-speed trenddata computation, and other computationblocks are available.SEBOL BlockThis function block permits use of theSEBOL language. This language candescribe ideal batch control functions,

enabling simple adaptation to more advancedsequence control.SFC BlockThis function block permits the use of thesequential function chart (SFC), whichgraphically describes sequence control. Thefunction meets IEC SC65A/WG6 standards.

Faceplate BlocksThese are man-machine interface functionblocks which permit the operator's identifica-tion of multiple function blocks as one tag.They are available in analog, sequence, andhybrid types.

Subsystem IntegrationFunctionMore plant equipment and large electricmotors are now being incorporated with pro-grammable controllers for monitoring andautomation. In addition, many analyzers andmeasurement devices are becoming moreintelligent. These advances mean that thesesubsystems all create greater demand fordata exchange.

The FCS is equipped with a function thatpermits communications with these subsys-tems, integrating them for total system control.Modules or dedicated nodes can be used forsubsystem communications where vastamounts of data are transferred.

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FCS functions

Regulatory controlApplication Sequence

controlBatch control

Regulatory controlfunction block

Sequence controlfunction block Calculation block

Function blocks

SEBOL block

Analog faceplateblock

Faceplate blocks Hybrid faceplateblock

Sequence faceplateblock

SFC block

Subsystem Integration Function

FCU (field control unit)

Node interface unit

Communication module

Communicationnode

V net

RS-232CRS-422RS-485

Subsystems

● SIEMENS

● GOULD

● PLC-5

● MELSEC

● GC1000

Engineering-oriented FCS Hierarchy Dual Operation and Redundancyfor Superior Reliability

Control-functionConfigurations DescribedArchitecturally andHierarchicallyThe control function needs to be configuredmore rationally for extremely large and com-plex applications. To meet this requirement,FCS control functions are architecturallydescribed. With its partitioned control draw-ings and areas (each containing functionblocks as the smallest unit), the FCS can beefficiently engineered for even huge andcomplex applications.

Control AreasA control area is a large unit describing controlof one plant area which contains, for example,reactors, distillation columns, or furnaces. It isa logically partitioned, virtual control station.Up to eight independent control areas can beestablished in one FCS.■ The control function of each control areacan be loaded, builder-configured, and test-operated. Each control area can be engi-neered without affecting other control areas, aslong as these other areas are not involved insignal exchanges.■ A maximum of eight control areas can beengineered simultaneously, greatly improv-ing engineering productivity.■ The data resources of a specific controlarea can be shared with other areas. Forexample, data in one control area, whereequipment A is located, may be copied orpartially modified as desired, and then usedfor equipment B and C which are located inother control areas.

Control DrawingsA control drawing is a control group com-prised of two or more function blocks.Grouping partial-control functions of equip-ment in one group, for example, can makeengineering and maintenance operations easi-er. Plant monitoring, process monitoring,and other cross-sectional functions can alsobe grouped as a control drawing.■ Function blocks of different types, such asregulatory and sequence blocks, can residewithin the same control drawing.■ Function block signals can be freely exchangedbetween control drawings. The I/O connec-tions between function blocks in differentcontrol drawings are the same as those withinone control drawing.■ The loop configuration as well as thegrouping of function blocks in a controldrawing can be registered as a model orcomponent. They can then be copied ormodified, making engineering more productive.

Yokogawa's Next-generationFCSA controller-freezing glitch while your plant isin operation could seriously disrupt the entireproduction schedule. The CENTUM CSsystem employs dual redundancy for muchof its equipment, from the V net communica-tions function and node buses to the RISCchip-incorporated process controller (CPU).In the event of a glitch, control of the processorcards is instantly transferred to the standbycard without a moment's failure, ensuringunimpaired high-speed processing and relia-bility.

"Pair-and-spare" DesignThe "pair-and-spare" design, with dual-redundant processor card and CPU, offersfunctions not possible in conventional standbyredundancy design.■ Transient computation errors, which can betriggered by electric noise or caused at aninitial failure stage, are detected when thetwo CPUs make computational comparisons.This function is backed up instantly usingthe standby processor card.■ The standby processor card executes controlcomputations at all times, in synchronizationwith the current processor card. Thus con-trol continuity is maintained regardless ofcard transfers.■ The "pair-and-spare" design has also con-tributed to an impressive improvement incomputation-error detection for the CPU.■ The design also relieves system-designersfrom the extremely complicated engineering

task of making allowances for cases of dis-continuity, when preparing an FCS-compatibleuser control program.

Dual-redundant FCS components:● Processor cards● CPU● V net● Communication buses● Power system● RIO buses● I/O modules

23 24

FCS reliability

Dual-redundant FCS Architecture

Control areas

Control drawings

Function block

Area

1Area

2Area

3Area

4 • • • • • •

• • • • • •

V net

Coupler

Processor card Processor cardV net I/F

CPU 1

CPU 2

Mainmemory

(with ECC)

Comparator

Power cardRIO bus

com. card

RIO bus

Input module

Outputmodule

Dual-redundant node

Dual-redundant FCU

Com.card

Com.card

Com.card

Com.card

V net I/F

CPU 1

CPU 2

Mainmemory

(with ECC)

Comparator

Power cardRIO bus

com. card

Coupler

Engineering Support atEvery StageSystem engineering begins the moment asystem is conceptualized, and continuesthrough design, manufacture, testing, startup,functional modifications and additions,upgrading, and so on. The CENTUM CSengineering function provides optimumcapability and support for a friendly workenvironment at each of these stages, withcomplete system support.

Open EngineeringEnvironment and ShortLead TimeTo rationalize system generation and de-bugging operations, which make up the bulk ofengineering work, the CENTUM CS engi-neering environment is available at the ICSand PICS as well as engineering worksta-tions. This lets a number of engineers worktogether, and effectively shortens the leadtime required for engineering.

Full-fledged TestingFunctions To Meet YourNeedsWith the CENTUM CS test function, the statusof the test subject action is displayed on theengineering workstation in the same way it isdisplayed on the ICS operation panel. Thus,the engineer can view the actual operationimage while running a test, and can effec-tively test FCS processes.

FCS Simulation FunctionFCS functions and operations can be testedusing a simulator. Just one engineeringworkstation is needed to use this FCS simula-tor, allowing modifications to be made to thecurrently running system without using anactual FCS.

Wireless-debug FunctionThis function performs tests using an actualFCS. In the test, software-provided I/O signalsare used instead of actual field wiring. Thewireless de-bug function permits more elabo-rate testing operations than would otherwise bepossible.

25 26

Engineering environment

Complete Engineering Function For aFriendly Work Environment

Test panelTest panel

Control function

FCS simulator

EWS

FCS

Simulation-test panel

Control function

Uniform Builder Environment for EffortlessSystem Generation

Yokogawa's ImpressiveEngineering Capabilities

Simplified BuilderOperations

Builder PanelsMotif-standard windows are used. Windowdisplay-format and operations are uniform,can be easily learned, regardless of buildertype.

CAD-oriented BuildersGraphic, drawing, and logic-chart buildersadapt CAD-oriented methods for using amouse, ensuring easy-to-grasp graphic visual-ization of the overall interrelated contents.Fill-in-the-form (FIF) format is used forother builders requiring data and characterentries.

Self-documentation FunctionThe database list created with a builder can beprinted out as required. This function is alsoused effectively for system configuration,maintenance, equipment additions, and modi-fications. In addition, the relationshipbetween a specified tag name and anothertag can be retrieved and printed out, as canthe control drawing or graphics panel used.

System configuration projects involve aseries of engineering tasks at every step ofthe process. And these tasks must be per-formed in a limited period of time.Yokogawa's engineering experts performthese tasks in any industry - refining, chemicalor petrochemical products, iron and steel,nonmetal and ceramic, pulp and paper, food,pharmaceutical products, electric power, gasand oil, water and wastewater, textile, and soon. Our engineers have a thorough knowl-edge of plants and control systems. They arecapable of performing tasks during everyaspect of the project, to ensure installation of asystem that fits your needs.

User-oriented Feasibility StudiesFully understanding what the user needs isthe first requirement in any engineeringassignment. Yokogawa conducts a thoroughfeasibility study of your processes and plant,working in coordination with you. We alsodraw up future concepts. Yokogawa believesthat looking at a job from the customer'spoint of view is the basis of any engineeringtask.

Detailed Project PlanningCost estimation, scheduling, and otherdetails are presented only after the totalvision of your project has been clearlygrasped.

Forward-looking System-EngineeringYokogawa's abundant resources - applicationtechnologies, experience, and know-howextending from continuous processes to

batch and discrete processes - are put toadvantage when designing the most idealcontrol system for your plant. The result will beintegrated as a library to allow application toplant expansion and future projects.

Project Management forSuccessThe success of a project depends almostentirely on project management. Yokogawa'sengineers manage and coordinate theprogress of the entire project at every stage.Their efforts ensure that the project progressessmoothly as scheduled.

Start-up ServiceYokogawa assigns its expert engineers toyour plant to ensure safe and untroubledstart-up of the system and designed plantoperation.

27 28

Engineering abilities

Experienced Engineers Support Precise SystemConfiguration

Builder menu

FIF format builder

Control drawing builder

Graphic builder

Application Software Packages

Refined Software PackagesSupport Advanced SystemOperationsPlant operations constantly demandimproved control and maximized control sta-bilization, in the search for higher yield andquality. Yokogawa has an extensive lineupof advanced software packages ready forapplication at all levels of production control -operation, management, production, simula-tion, and so on. These highly reliable packagesare the result of Yokogawa's unique tech-nologies and rich expertise, and are designed tohelp you cut costs, increase efficiency andimprove quality.

Batch-control Packages

CS Batch packageThis comprehensive package includes com-plex batch-process operation and controlsoftware which meets ISA S88 standards.

Standard recipe data managementpackageThis software is used to file large amounts ofrecipe data at the ICS, load the required datafrom the file, and use them to execute a controlsequence. The package permits operationmonitoring and data gathering. It also sup-ports batch processing of equipment modulesin various arrangements.

Standard batch report packageThis software makes it possible to create,edit, and print spreadsheet-type reports onplant operations, using the CS Batch or therecipe data management function.

Advanced-control Packages

Multivariable model predictive control(DMC/idcom-Y) packageThis package enables the use of AspenTech's multivariable model predictive con-troller for DCS level control. Unlike con-ventional identification models, the con-troller used here has an algorithm that sup-ports non-linear processing and permits on-line model-gain modifications.

Predictrol packageThis software uses its own process model forthe on-line prediction of process actions, andcomputes the most appropriate control out-put according to predictions. This permitsstable, automatic control of a process, using atechnology superior to proportional integralderivative (PID) control.

Fuzzy logic control packageWith this package, the expertise of skilledoperators and engineers, which cannot easily bemeasured, is made applicable to actual controloperations. The IF-THEN rule and member-ship functions are used in describing theexpertise acquired during many years ofpractice. This software is ideal for theautomation of plants where operationsdepend on the experience and intuition ofskilled operators.

Process-database packages

Management Information Function(MIF)PackageThis package collects process data and ICShistorical data. The gathered data can be dis-played using an exclusive trend window, orstatistically computed and presented as anSQC chart. In addition, closing and otherdata can be edited into spreadsheets.

Exaview (process data acquisition, con-trol and management) packageThis package performs the real-time collec-tion, management and storing of regulatoryprocess data and messages. The saved datamay be used to obtain closing data, output inspreadsheets, ASCII- or RDB-converted, etc.

DDE communications function packageA Windows-based personal computer can beused to access FCS process data and ICStrend data, historical data and closing data.The data can then be used with a personalcomputer for reference, setting, editing andanalysis. It can also be collected by the PCperiodically, then used to generate spread-sheets and charts.

TriFellows package *This software provides a Windows-basedpersonal computer with various functions:long-term process-data storage, spreadsheetcreation, trend-chart display, graphical monitordisplay, and software printer. Databases can becreated for each distributed control system(DCS), permitting one client to access allDCS data in a client-server system configura-tion.

PD-Lab (trend file management, opera-tion, analysis tool) package *The management of ICS trend files and variousanalyses of these files can be executed on apersonal computer. This software tool uses asystem of menus and provides a program-ming-free analytical environment.

Operation SupportPackages

Exapro-plus (advanced operation sup-port system) packageThis is an expert system designed for buildingprocess operation monitoring, fault-diagnosing,and fault-detecting systems. It can also beused to configure an advanced alarm systemwith precise fault-tracking capabilities.

LinkforSap communications packageThis key operation package provides theinterface for SAP R/3 PP-PI (made by SAPA.G. Co., Ltd.). Regulatory or batch-con-trolled plant data can be directly connectedto an enterprise information system. Thispermits downloading of production instruc-tion data generated by the SAP product, anduploading of CENTUM CS production data.

Exanalp (scheduling) packageA plant operation schedule can be createdautomatically, following a production plan.The schedule can be easily formulated,whether production is multi-product/small-lot, or involves advanced, complex processes.The resulting schedule is displayed using aGantt chart.

Training Package

Plantutor (training simulator) packageThis is a simulation program used to trainplant operators. It comes with a tool for easycreation of process models. Trainees canlearn how to start up, operate and shut down ahighly automated plant, and learn procedures tofollow in many simulated situations, includingemergencies.

Industrial Packages

Offsite control blocks packageThis is a package of function blocksdesigned for application to the flow rate,batch, and preparation control at an offsitepetroleum production facility.

B/M7000 XL single-window package

: Indicates the package runs on a supervisory computer.

: Indicates the package runs on a supervisory PC.

* : Indicates the package is produced by Yokogawa

System Engineering Co., Ltd.

29 30

Extensive software lineup

I/O Module Replacement with noInterruption in OperationCENTUM CS I/O modules can be replacedeasily and quickly without affecting otherI/O modules or interrupting plant operations.

On-line Maintenance withoutInterrupting the FCSFunctionOne should not have to shut down the entireFCS when adding or modifying its controlfunctions. The on-line maintenance functionallows database creation and loading foreach control area, control drawing, and func-tion block, without interrupting FCS opera-tion.

32

Safeguarded system performance

Maintenance and Utility FunctionSafeguard System Performance

Strict, Round-the-clockDiagnostics Throughout theEntire SystemAn extremely advanced and complex pro-duction system must be continually moni-tored to ensure normal operation.

The CENTUM CS system maintenancefunction monitors and diagnoses ICS andFCS system conditions during operation. Itsmonitor function permits monitoring of thestatus of each individual I/O module. Theutility function can be used to managebuilder-generated databases, track the history ofmodifications, and load and save of softwareand FCS parameters.

31

Example of On-line Function-block Maintenance

EWS

ICS ACG

FCSSystem status panel

Current ICS status panel FCS status panel

Developed FCS status panel

Control areas

Control drawings

Function block

1 2 3 4 • • •

• • • • • •

System maintenance

System alarm message display

FCS status display

Current ICS status display

Equalization function

Operation environment setup function

System maintenance function

Complete Support To Keep Your PlantUp to Optimum Standards

Round-the-clock SupportEvery Day of the YearThe Field Support Center of YokogawaEngineering Service Corporation (YSV) is incharge of supporting CENTUM CS systems inoperation. Support is available 24 hours aday, 365 days a year. Various support menusare offered for the convenience of users. TheCenter is equipped with an analytical supportsystem and security lock-installed dedicatedoffices. The Center assures quick trou-bleshooting and finds solutions, with ourcustomer service engineers (CSE) in differ-ent parts of the world working in coordina-tion with clients.

Total Maintenance ManagementSystem (BEST)A maintenance plan and inspection schedule isdetermined for each plant, based on theresults of plant diagnoses. This preventsunnecessary maintenance and reduces mainte-nance costs. The BEST system optimizesthe maintenance program by effectivelycombining maintenance menus, selectingthem according to the determined inspectioncycle and the system's overall condition andenvironment.

Remote Maintenance SupportThe user's CENTUM CS system and ourField Support Center are connected via tele-phone for round-the-clock diagnosis of theremote maintenance support system. Ourexperienced system engineers analyze thesituation immediately when the user systemhas a glitch, and quickly find a solution.

Our remote maintenance support system isavailable for CENTUM CS systems whereverthey are in operation. Overseas user systemscan be connected to the support system viatelecommunication satellites. This ensuresthe same reliability, whether the plant islocated in Japan or abroad.

Servicing-support InformationSystemThis system supports the work of our cus-tomer service engineers. They are constantlyprovided with updated information on ourproducts, error case histories, maintenancesupport, distribution, etc. This informationhelps them minimize plant downtime andprevents breakdown recurrence.

Automated Notification SystemDuring on-line monitoring, any indication of amalfunction is transmitted to the operator'spersonal computer or beeper. This systempermits centralized monitoring of systemequipment located in different parts of factory,and saves manpower too.

33 34

Field support operations

Failure/alarm

In-plant PC

Field Support Center

Diagnosis systemTechnical support engineers

User system

User system

Distribution center

Modem

Telephone lines

Remote PCBeeper

FieldSupportCenter

Special training courses are available at a Center for your new employees,or for staff involved in plant construction. We also give special coursesand conduct training on site.

36

Comprehensive programs

Comprehensive Training Gives YourStaff CENTUM CS Expertise

From the Basics to SystemManagementCENTUM CS hardware and software arehighly dependable, but they still requiretrained operators to keep the system runningoptimally. At a Yokogawa Training Centeryour personnel will become all-round CENTUM CS system experts after undergoingcomprehensive training by our professionalinstructors, who are experienced professionalsin their field.

Training Programs AvailableGloballyOur training centers are located in majorparts of the world, offering various trainingcourses in local languages. Special coursesgiven at your company are also available ondemand.

35

CENTUM CS Training Courses

Basic Course

This course is for operators and engineers notyet familiar with digital instrumentation sys-tems, and for those intending to take theengineering course. They will learn thebasics of the ICS operation and monitoringfunction and the FCS control function, andgain hands-on operation experience.

Curriculum:● CENTUM CS system configuration● Control station configuration● ICS operation principles (video)● Controller functions● ICS operation training● Sequence control functions and training● ICS process report functions and training● Utility functions and training● System maintenance functions and training

Engineering Course

This curriculum is for engineers who will beplaced in charge of system design, instrumenta-tion and maintenance. Trainees will operateEWS to learn system configuration definitionmethods, regulatory and sequence control func-tion preparation, operation and monitoringfunction preparation, etc. They will also tryout their own programs using the test function.

Curriculum:● ICS and FCS hardware configuration● Startup of EWS● System configuration and use of ICS builders● Use of FCS builders● Regulatory control functions and training● Detailed instrument specifications● File management● Test function● Sequence control functions and training● Use of graphic builders and training

System Management Course

This course is for those who will be responsiblefor system management or maintenance. Thecourse covers periodic ICS and FCS inspectionand ICS and EWS-incorporated system man-agement.

Curriculum:● File management and on-line maintenance● Self-documentation functions● ICS system management (install, backup,

etc.)● EWS system management (install, backup,

etc.)

Management Information Function (MIF)Package Course

CS Batch Package Course

User-C Language Course

Other courses are offered as required.

3837

Yokogawa's Global Sales and Service Network

● "UNIX" is the name of an operating system developed by AT&T Bell Laboratories (U.S.A.).● "Motif" is a trademark of Open Software Foundation, Inc. ● "X-Window" is a trademark of the Massachusetts Institute of Technology.● "Ethernet" is a registered trademark of XEROX Corporation.● "TriFellows" and "PD-Lab" are trademarks of Yokogawa System Engineering Corporation.● "Windows" is a trademark of Microsoft Corporation (U.S.A.).● "Plantutor" is a trademark co-registered by Mitsui Toatsu Chemicals, Inc. and Yokogawa

Electric Corporation.● "DMC" is a registered trademark of Aspen Tech Corporation.● "SAP' and "R/3" are registered trademarks of SAP AG (Germany).● Other company and product names used in this pamphlet are trademarks or registered

trademarks of their relevant companies.

Yokogawa offices and agents

YOKOGAWA ELECTRIC CORPORATION

YOKOGAWA ELECTRIC CORPORATIONWorld HeadquartersWorld Sales Headquarters9-32, Nakacho 2-chome, Musashino-shi, Tokyo 180-8750, JAPANTel.:81-422-52-5634 Fax.:81-422-52-9802

North AmericaManufacturing/Sales/Service OfficesYOKOGAWA CORPORATION OF AMERICAHeadquarters & PlantGeorgia, U.S.A.

East Regional OfficeGeorgia, U.S.A.

Mid-West Regional OfficeIllinois, U.S.A.

South-West Regional OfficeTexas, U.S.A.

East Sales OfficeNew Jersey, U.S.A.

South AmericaYOKOGAWA America Do Sul S.A.BRAZIL

EuropeYOKOGAWA EUROPE B. V.European HeadquartersTHE NETHERLANDS

YOKOGAWA NEDERLAND B. V.THE NETHERLANDS

YOKOGAWA ITALIA S. r. l.ITALY

YOKOGAWA AUSTRIA Ges. m. b. H.AUSTRIA

YOKOGAWA BELGIUM N. V.-S. A.BELGIUM

YOKOGAWA UNITED KINGDOM LTD.UNITED KINGDOM

YOKOGAWA DEUTSCHLAND GmbHGERMANY

YOKOGAWA ESPANA, S. A.SPAIN

YOKOGAWA CONTROLE BAILEY S. A.FRANCE

LTD. YOKOGAWA ELECTRICRUSSIAN FEDERATION

Middle EastYOKOGAWA MIDDLE EAST E. C.BAHRAIN

AsiaYOKOGAWA ENGINEERING ASIA PTE.LTD.SINGAPORE

HANKUK YOKOGAWA ELECTRICCO., LTD.KOREA

YOKOGAWA XIYI CORPORATIONCHINA

YOKOGAWA XIYI CORPORATION, BEIJING SALES HEAD QUARTERSCHINA

BEIJING METALLURGY YOKOGAWAAUTOMATION ENGINEERING CO., LTD.CHINA

BEIJING YOKOGAWA AUTOMATIONENGINEERING CO., LTD.CHINA

YOKOGAWA TAIWAN CORPORATIONTAIWAN

YOKOGAWA ELECTRIC (MALAYSIA),SDN. BHD.MALAYSIA

YOKOGAWA KONTROL (MALAYSIA),SDN. BHD.MALAYSIA

YOKOGAWA (THAILAND) LTD.THAILAND

YOKOGAWA BLUE STAR LTD.INDIA

P.T. YOKOGAWA ENGINEERINGINDONESIAINDONESIA

YOKOGAWA PHILIPPINES INC.PHILIPPINES

OceaniaYOKOGAWA AUSTRALIA PTY. LTD.AUSTRALIA

Printed in Japan,901(YG)