01 ik iesys e communications overview

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IK-IESYSCommunication in AutomationPage 1

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IK-IESYS / Communication Overview Page 1

Automation and Drives

March/2007

Siemens AG 2007 - Subject to change witho ut prior notice

Communication in Automation

Contents Page

The automation hierarchy .................................................................................................................. 2

Process/field communication, data communication ......................................................................... 3

SIMATIC subnets ............................................................................................................................... 4Point-to-point link modules ................................................................................................................. 5

EIB, European Installation Bus (KNX) in building automation ........................................................... 6

Actuator Sensor Interface, AS-i bus .................................................................................................... 7

MPI communication ............................................................................................................................ 8

PROFIBUS ........................................................................................................................................ 9

Industrial Ethernet ............................................................................................................................... 10

PROFINET based on Industrial Ethernet ............................................................................................ 11

Routers ............................................................................................................................................... 12


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Management level Higher-level tasks which are important to the overall operation of the system areprocessed at the management level (management functions). In addition tosaving process values, this also includes optimizing and analyzing process functions aswell as their output in the form of logs. The data required for this purpose are compiledand processed company-wide.

It is also possible to access different sites from the management level.The number of nodes can exceed 1,000.

Cell level All automation and optimization tasks are processed independently at cell level.Programmable controllers, PCs, and HMI units are interconnected at cell level.

Field level The field level is the link between the systems and the programmable controllers. Thefield devices monitor, signal and forward thecommands from cell level to the systems. At this level, the volume of data transferred isrelatively small. Hierarchical communication is typical, i.e., several field devicescommunicate with one master.

Actuator/sensor level

At this level, a master communicates with the actuators and sensors connected to itssubnet. It is characterized by fast response times for a few data bits.

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The automation hierarchy

Managementlevel

Cell level

Field level

Actuator/sensor level

Industrial Ethernet

PROFIBUS/MPI

AS interface


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Process or field communicationProcess or field communication is used to link sensors and actuators to a controller.The connection can be made via an interface integrated into the CPU or using interfacemodules (IMs, CPs).

SIMATIC and SIMOTION can be used with PROFIBUS DP and AS-Interfaceas well as EIB, which is the bridge between factory automation and buildingautomation.

Data communicationData communication is used for data exchange betweenprogrammable controllers or between programmable controllers and

intelligent partners such as PCs, computers, etc. SIMATIC and SIMOTION supportdata communication via Industrial Ethernet and PROFIBUS.

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Process/field communication, datacommunication


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SIEMENS offers the following subnets for the different communication tasks atcell level (non-time-critical) and field level (time-critical).

Point-to-point connection

Point-to-point connections are used primarily for non-time-critical data exchangebetween two stations or for the connection of devices such as OPs, printers, barcodescanners, magnetic stripe card scanners, etc.

AS-Interface The actuator-sensor interface is a subnet for the lowest process level of asystem. Binary sensors and actuators can be connected.

MPI The MPI subnet has been designed for tasks at cell level. The MPI (multi-pointinterface) is the multi-point interface in the SIMATIC S7. It has beendesigned as a programming device interface, i.e. for the connection of programmingdevices (commissioning and testing) and OPs (operator control and monitoring). TheMPI subnet can also be used to link just a few CPUs.

PROFIBUS PROFIBUS is the network for the cell and field level in the open, multi-vendorSIMATIC communications network. Two versions are available:

At the cell level as PROFIBUS for non-time-critical communicationbetween intelligent nodes with equal priority.

As PROFIBUS DP fieldbus for time-critical, cyclic data communicationbetween intelligent masters and field devices.

Industrial Ethernet Industrial Ethernet is the network used at management and cell level in the open,multi-vendor SIMATIC communications network.Industrial Ethernet has been designed for non-time-critical transmission of largedata volumes and can be used to connect to networks on different sites

via gateways.

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SIMATIC subnets

- SINUMERIK, RCM- TI 505- non-SiemensPLC

S7-300S7-400 M7-400

OPs

SIMATIC S5

PROFIBUS DP

ET 200B/LET 200C

DP/AS-I link

AS-i (actuator-sensor interface)

AS-isubmodules

Sensors and actuatorsField device with AS-i ASIC

AS-i power supply

Industrial Ethernet

PROFIBUS

MPI network

Point-to-point

PC, OS PG

PG720

Cell level

Actuator-

sensorlevel


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A point-to-point link permits data to be exchanged over a serial interface between

Programmable controllers

Programmable controllers and PGs/PCs

Programmable controllers and non-Siemens systems

Characteristics of a point-to-point link using the example of the CP341

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Point-to-point link modules

1 interface

9.6 Kbit/s to 76 Kbit/sProgramming devicesPCs, computers

SIMATIC S5

Robot

controls

Scannersbarcodereaders,identificationsystems

Weighing systems,Controllers

Printers

Opto-electronics

S7-300S7-300

Protocols: ASCII 3964(R) RK 512 Printers Drivers can be reloaded

Physical characteristics: 20 mA (TTY) RS 232C (V.24) RS 422/485 (X.27)


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EIB, KNX The EIB (European Installation Bus) is now commonly used in Europe or buildingservices. It is supported by many representatives of the electrical and buildingautomation sector who have come together to form the European Installation BusAssociation (EIBA)

. A defined standard interface allows products by different vendors to be used in a

common installation.One of the objectives of the EIB technology is to control the operationalfunctions and processes in a building by means of the common bus cable. For controlpurposes, a twisted pair bus cable is routed through the building. In addition totransmitting the control messages, it also transmits the 24 V supply for the bus nodes.EIB is a distributed, event-driven serial bus system based on CSMA/CA. It is used toacquire, control,monitor, and signal all operational functions in a building or largefacility.

The ETS2 configuring tool is used to configure the system on the EIB side.

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EIB, European Installation Bus (KNX) in buildingautomation

EIBpushbutton

unit

DP/EIB link

Powerlinebus couplingunit

Powerlinecoupler

Powerline 230 V

DriveWind sensor

EIB binaryinputmodules

KNX


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AS-Interface AS-Interface is an open, international standard based on EN 50295 and IEC 62026-2for process and field communication. It is supported by the world's leading vendors ofactuators and sensors. AS-Interface is a single-master system. For the Siemensprogrammable controllers, there are communications processors (CPs) and routers(links), which control the process or field communication as masters, and actuators and

sensors which can be addresses as AS-Interface slaves.

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Actuator-sensor interface, AS-i bus


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MPI, multi-point interfaceMPI supports a variety of baud rates to help ensure the accuracy of the transmitteddata.An MPI subnet can connect any combination of SIMATIC devices:

S7 controllers (such as S7-300, S7-400 or C7) HMI devices (such as operator panels or touch panels)

Programming device (PG) or programming station (PC)Every SIMATIC CPU supports the MPI protocol. (S7-200 is only an MPI slavedevice.)

You do not need a CP module (communications processor) to connect an S7 device toan MPI network.

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MPI communication

Data exchange: 187.5 Kbit/s to 12 Mbit/s

Up to 32 bus nodes,up to 32 active connections per CPU

Communication services: PG/OP communication functions

Global data communicationfor small data volumes,without programming overhead

S7 standard communication forsmall data volumes up to 76 bytes

Cost-effective communicationintegrated as standard


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PROFIBUS PROFIBUS is a bus system for process and field communication in cell networks witha small number of nodes and with field devices for data communication compliant withIEC 61 158/EN 50 170. It is open for the connection of non-Siemens components whichare also compliant with the relevant standards.

PROFIBUS DP For fast, cyclic data exchange with field devices

PROFIBUS PA For applications in process automation and in the intrinsically-safe area

Data communicationPROFIBUS FDL and for data communication between programmable controllersof various FMS vendors.

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PROFIBUS


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Industrial Ethernet Industrial Ethernet, which is based on the IEEE 802.3 and IEEE 802.11 standards,allows you to connect your programmable controller to your office networks. IndustrialEthernet supports information technology (IT) services which you can use to accessand work with production data from the office environment.

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Industrial Ethernet


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PROFINET PROFINET is the innovative and open Industrial Ethernet standard (IEC 61158) forindustrial automation. With PROFINET, devices can be linked from the field level all theway to the management level. PROFINET permits integrated communication, supportssystem-wide engineering and uses IT standards all the way down to the field level.

PROFINET IO PROFINET IO enables distributed field devices (IO devices such assignal modules) to be connected directly to Industrial Ethernet. During the familiarconfiguration process with STEP 7, these field devices are assigned to a centralcontroller ("IO controllers").Existing modules or devices can continue to be used with PROFINET-compatibleinterfaces or links, thereby safeguarding investments already made by PROFIBUSor AS-Interface users. A configuration with standard and fail-safe modules in a singlestation is also possible. An IO Supervisor serves HMI and diagnostics purposes as onPROFIBUS using hierarchical diagnostics screen forms (overview and detaileddiagnostics). User data is transferred by means of real-time communication;configuration and diagnostics by means of TCP/IP or IT standards. The simpleengineering which proved its worth on PROFIBUS has been used for PROFINET also.From the point of view of programming with STEP 7, it makes no difference whether anI/O device is accessed via PROFIBUS or PROFINET.

PROFINET CBA PROFIBUS International has defined a standard for implementing modular plantstructures: PROFINET CBA (Component Based Automation). Modularization hasalready proven its worth in mechanical and plant engineering. Parts that are requiredfrequently are premachined and can quickly be combined to build an customized unitfollowing the placing of an order. With the help of software components,PROFINET CBA is extending modularization to the field of plant automationtechnology. Software components are encapsulated, reusable software functions. Theycan be individual technological functions such as controllers or user programs for entiremachines. Like blocks they can be flexibly combined and easily reused regardless oftheir internal programming. Communication between software componentstakes place exclusively via component interfaces. Outwardly, only the variables

required for interaction with other components can be accessed on these interfaces.Software components are created with STEP 7 or other vendor-specific tools. SIMATICiMap is used for system-wide configuration based on the graphical interconnection ofcomponents.

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PROFINET based on Industrial Ethernet

PROFINET IO

PROFINET CBA


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Routers Routers from one bus system to another are implemented using links, controllers(PLCs) or PCs. On controllers or PCs, integrated interfaces and communicationsprocessors (CPs) can be used for this. Links forward data autonomously from onenetwork to the other.

Available links IE/PB Link and IE/PB Link PN IO for the transition from Industrial Ethernet to

PROFIBUS (also for fail-safe communication)

IE/AS-i LINK PN IO for the transition from Industrial Ethernet to AS-Interface

IWLAN/PB Link PN IO for the transition from IWLAN to PROFIBUS

PB DP/PB DP and PB DP/PB PA for linking DP/DP and DP/PA networks

DP/AS-i LINK Advanced and DP/AS Interface Link 20E for the transition fromPROFIBUS to AS-Interface

DP/EIB Link for the transition from PROFIBUS to KNX/EIB

In the case of PLCs, e.g., SIMATIC S7-200, S7300, S7-400, SINUMERIK orSIMOTION C, data are exchanged between the individual networks by means ofcommunications processors or integrated interfaces. Data are linked by meansof a controller, and thus forwarded to the other network as preprocessed data.

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Routers

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