System Integrity Tester (SIT)

Architecture :

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.

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



    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)

    System Integrity Tester Brochure

    Download Brochure