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System Integrity Tester(SIT)

System Integrity Tester Improves reliability of "Railway Signaling Interlocking" by

  • Automating the Test process
    • Test Case Generation
    • Test Case Execution
    • Validation of Test Results
  • Produce Test Results document for Evidence.
  • Architecture :


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Description :

The conventional (manual) system has the following limitations

  • Test procedure is not fully defined
  • No document of Testing ( test plan )
  • No evidence of Test Results
  • No evidence of validation of test results
  • No scope for verification of tests done since no tangible output results out of testing

      System Integrity Tester

Modules of system :

  • Data Logger
    • Processor based system
    • Logs the status of Relay contacts
    • Connected to PC by serial port
    • Works on 24 v DC
  • Relay Driver
    • Processor based system
    • Relay Driver Cards (128 Output) – Quantity dependent on Size of Panel ( No. of routes)
    • Controlled by software program in the PC
    • Connected to PC by serial port
    • Works on 24 v DC
  • PC (Tester software)
    • Connected to Data logger and Relay Driver by serial ports
    • Loaded with yard specific test software and software to communicate with relay driver and data logger
    • Test status displayed on real time basis
    • Report generation

This system is applicable for

  • Route setting type panels
  • non-Route setting type panels with Table of Control(TOC).

Following types of System Integrity tests :

  • Negative test of controlling functions as per TOC
  • Route release test - light engine and long train
  • Test for route locking
  • Test for back locking or route holding
  • Test for approach locking
  • Red-lamp protection test
  • Aspect sequence control test
  • Lamp cascading test
  • Point track locking test
  • SMKEY locking test for different assets
  • One signal one train test
  • Crank handle and LX Gate locking test
  • Square sheet test

Process of testing :

  • Representation of Table Of Control in terms of data logger inputs
  • Instructions for carrying out tests are defined
  • Tests are converted to a software program based on Table Of Control
  • Desirable test results are generated by software program based on Table Of Control
  • Online test results are compared with desirable results through software program
  • Status of the required relays are taken by the system from Data logger


System Integrity Tester

Testimonial :

Tested 33 Stations(nearly 3000 Routes) of Indian Railways of almost all available Interlocking practices of British/Siemens PI, RRI as well as Electronic Interlocking.

Usage/Application Areas :

  • Railway Signal Interlocking testing in
    • Panel Interlocking ( PI )
    • Route Relay Interlocking (RRI)
    • Solid State Interlocking (SSI)

Download Brochure

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