signalling technique for railways presentation: … signalling systems ... • the pixel data of...

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10Presentation_EURO-ZEL2010.ppt

Signalling Systems

www.scheidt-bachmann.dewww.scheidt-bachmann.com

Scheidt & Bachmann GmbHMönchengladbach, GermanyEURO - Žel 2010

Signalling Technique for Railways

Presentation:

SECURE DISPLAY PROCEEDINGInterlocking System

ZSB 2000

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Shortly after the company’s foundation (1872), they started the manufacture of signal engineering equipment for railway traffic. The mechanical constructions of that time changed into today’s computer-controlled systems. This technology based on safety considerations and is today regarded as a trendsetter in the European market and beyond. This division determines the safety philosophy and the quality standards of all product areas.

Scheidt & Bachmann GmbH is a family-owned company in the fifth generation and has a reputation as a worldwide leading supplier of its kind of products. In its business divisions, it has formed its general origin of products and thereby set standards.

Company presentation

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Scheidt & Bachmann headquartersin Mönchengladbach

Systems for RailwaysSystems for Petrol Stations

Systems for Parking and Leisure FacilitiesSystems for Fare Collections

Product Lines

Quality Certifcate

ISO 9001 (since 1993)

Capabilities

g Research and Developmentg Productiong Project Managementg Sales and Service Network Worldwide

Human Ressourcesg appr. 1.950 employeesg more than 350 employees with university degreesg more than 200 personnel with over 25 years service g more than 100 trainees

Turnoverg more than € 300m pa

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• ZSB 2000 communication structure

• Necessity of a secured display proceeding + Solution according to Mü 8004

• Analysis of dislay system

• Graphics Device Interface (GDI)

• Secure display proceeding steps

• Cost saving potentials

Content

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• Dispatcher Level (Disposition Level)• consist dispatcher computer + station

computer

• PC´s, MS WinXP

• “display + operation“ program realised under Visual C++

• Station Level• consist station computer + secure

computer w/ train-route-modules FAM (2of2)

• bidirectional communication between station computer + secure computer (secure control level) are realised in different transmission ways

• CAN-BUS +

• RS232

ZSB 2000 communication structure

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connection along the route is realise via modem

• which allows bidirectional communication within disposition level (station computer dispatcher desk computer)


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• station computer receive the transmitted CAN-Telegrams (system bus) pass it fuhrter to dispatcher desk


• station computer supports an interface for safety control of operation procedures

Operation procedures can be even handled at dispatcher desk as well!

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necessary for:

• Actions realized by dispatcher with the result changing of (field) element condition

• Verification of element conditions as decision-maker for the best possible railway operational procedures

Necessity of a secured display proceeding

Solution acc. to Mü 8004 (safety rule)• Procedere acc. to guideline „Principle for a safety display (loup) for integrated

electronic control centre (IECC) and electronic block“• Basic principle based on poly canal secure display proceeding between secure control

level and dispatcher desk

• Using of two independent PC´s (dispatcher PC and station PC)

• Reading back of pixel bitmap of element via graphics device interface

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Analysis of display system Analysis of display system Display errorsDisplay errors• In modern PC-Systems is the way of a created bitmap in RAM very difficult to

understand, because...

• there are a lot of different chip sets on motherboard available (different procedure of memory mappings and different interfaces as well)

• the graphic system has a different technical architecture

• the access method between display-RAM and hardware of using graphic card is different

• Different serial and paralel ways of creation of the displayed pixel

• in regards of different colour, position, etc...

• or errors of LCD screens (chip on glass)

Best result is to involve the user (dispatcher) for verification the loup element!

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Using of Graphics Device InterfaceUsing of Graphics Device Interface

• Graphics device interface is a standardized operation system and an interface for independent picture contents

• Example: PRINT SCREEN

• print screen function read out via GDI and displayed always the correct screen content

• output format is independent from the existing graphic system

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The secure display proceeding (Secure display proceeding = ANSI; in German language “Anzeige-Sicherung“) comprise the following steps:

Active testing of the display hardware of the dispatcher desk before realizing a secure routine (e.g. Set up of a train trafficability blockade; in German language “Befahrbarkeitssperre”!)

Checking of the pixel data of the display image by:

Reading back of the display image for intention to secure and calculate the corresponding check sum (for the reference image) on dispatcher desk level

Preparation of reference image and calculation of the equivalent check sum in the station computer

Comparison of the two check sums in the secure control level (train-route-modules FAM)

Secure display proceeding steps (from dispatcher point of view )

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Display ProceedingDisplay Proceeding ((1) 1) –– Checking of display HWChecking of display HW

• As test pattern the current loup picture is used

• Loup will be switched from coloured loup to black/white illustration checked and confirmed by dispatcher

Realisation of Display Proceeding confirming of not colored loup content

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Display Proceeding (2) Display Proceeding (2) –– Checking of pixel dataChecking of pixel data• The review of data of current element state is required from safety level and accordingly

updates the display

• The pixel data of updated image at dispatcher desk monitor will read back from display RAM and generates a corresponding check sum

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rebuilding of loup

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Display ProceedingDisplay Proceeding ((3) 3) –– Creation of reference bitmapCreation of reference bitmap

• The station computer transmit a virtual reference image into the RAM and generates and calculates a corresponding check sum (code of 128-bit length)

• This image has the same resolution and colour as the image at dispather desk monitor

• The structure of this bitmap is independent from the graphic system

• The dispatcher computer read out a bitmap realised via graphics device interface and after that created a check sum as well

• Display source is in sub-system TA1 of safety system (train-route-module)

• The calculated check sum will be compared in the safety level with the check sum of station computer at later time

• The created check sum will be negated. As the result a difference mark is created corresponding of check sum in station computer.

• The negation mark will be delete in TA1/11 at least

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Display ProceedingDisplay Proceeding ((4) 4) –– Comparison of both check sum codesComparison of both check sum codes• The calculated check sums from dispatcher computer and station computer will be transfered

by data telegrams to secure control level sub-system TA1 and TA11 (train-route-modules) and tested for identify

• If the comparison of the check sums is succesfully the message “loup secured“ is displayed at the dispatcher desk.

• Now all coloured element symbols has the real displayed conditions.• The display will be stay in that condition up to the next element change occured

• If the comparation of check sums are not succesfully the secure control level will response w/ an error message and block any actions at dispatcher level

loup secured

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Cost Saving Potentials

expensive signalling real-time computer HW

special graphic card w/ separate rear-reading canal

needs more (track) cabling leads

expensive real-time operation system SW

cost intensive safety cathode ray tube monitors

Classic ILS

Scheidt & BachmannZSB 2000

commercial PC HW

commercial graphic card w/ multiple outputs for visualisation of station loups

only track cabling required for bidirectional communication

commercial operation system MS WindowsXP

commercial TFT-Screens for supervision of station loups at dispatcher desk

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Thank you very much for your attention!

Dipl.-Wirt.-Ing. Ingo KempeProject Manager – Sales Department South Europe

E-Mail: [email protected]

signalling technique for railways presentation: … signalling systems ... • the pixel data of...

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