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Questions and Answers
The requirement for indigenization of systems approved under cross acceptance may be exempted by the Railway Board.
The requirement for indigenization of systems approved under cross acceptance may be exempted by the Railway Board.
True (A)
The manufacturer is obligated to ensure the availability of spare parts for a minimum of 20 years.
The manufacturer is obligated to ensure the availability of spare parts for a minimum of 20 years.
False (B)
The manufacturer must provide training on EI technology to Railway officials at their own facilities.
The manufacturer must provide training on EI technology to Railway officials at their own facilities.
True (A)
The manufacturer is required to establish a testing and repair facility with specialized equipment, including fault diagnostic systems and test jigs.
The manufacturer is required to establish a testing and repair facility with specialized equipment, including fault diagnostic systems and test jigs.
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The annual repair contract is mandatory for a period of 10 years after the warranty expires.
The annual repair contract is mandatory for a period of 10 years after the warranty expires.
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Type, acceptance, and routine tests are not required for systems approved under cross acceptance.
Type, acceptance, and routine tests are not required for systems approved under cross acceptance.
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The manufacturer needs to provide certificates of type tests conducted according to national standards.
The manufacturer needs to provide certificates of type tests conducted according to national standards.
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The manufacturer must submit a total of 5 documents to demonstrate compliance with the requirements in paragraph 15.
The manufacturer must submit a total of 5 documents to demonstrate compliance with the requirements in paragraph 15.
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The manufacturer must provide a trouble-shooting chart that allows for the replacement of defective PCB cards at the site.
The manufacturer must provide a trouble-shooting chart that allows for the replacement of defective PCB cards at the site.
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A detailed power supply arrangement is not required from the manufacturer.
A detailed power supply arrangement is not required from the manufacturer.
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The manufacturer is responsible for providing the version number of signaling equipment according to their own practice during cross-acceptance.
The manufacturer is responsible for providing the version number of signaling equipment according to their own practice during cross-acceptance.
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Software checksum of EPROMs must be provided as per RDSO/SPN/144.
Software checksum of EPROMs must be provided as per RDSO/SPN/144.
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The documentation provided by the manufacturer does not include any details about the software algorithm or its validation procedure.
The documentation provided by the manufacturer does not include any details about the software algorithm or its validation procedure.
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Visual inspection is included as part of the type tests.
Visual inspection is included as part of the type tests.
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Environmental tests are not required for acceptance tests.
Environmental tests are not required for acceptance tests.
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Only one equipment must pass all the type tests.
Only one equipment must pass all the type tests.
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Computerised testing for permutations and combinations is part of the acceptance tests.
Computerised testing for permutations and combinations is part of the acceptance tests.
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The purchaser or his nominee has the discretion to call for another equipment in case of failure.
The purchaser or his nominee has the discretion to call for another equipment in case of failure.
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System Diagnostics test is not required for type tests.
System Diagnostics test is not required for type tests.
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Acceptance tests have more requirements than type tests.
Acceptance tests have more requirements than type tests.
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Fail-safety tests are conducted on all cards.
Fail-safety tests are conducted on all cards.
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A flashing indication on the VDU screen signals that there is a healthy communication status between the VDU & EI.
A flashing indication on the VDU screen signals that there is a healthy communication status between the VDU & EI.
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The colour monitor is considered healthy if only two of the three dot markers (Red, Blue, and Green) are displayed.
The colour monitor is considered healthy if only two of the three dot markers (Red, Blue, and Green) are displayed.
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Diagnostic functions can be performed from the VDU terminal.
Diagnostic functions can be performed from the VDU terminal.
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Hot standby VDU switch over can occur in case of a mouse failure.
Hot standby VDU switch over can occur in case of a mouse failure.
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All power supply for VDU must be arranged by the Railways.
All power supply for VDU must be arranged by the Railways.
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It is possible to display an enlarged view of a portion of the yard on the monitor.
It is possible to display an enlarged view of a portion of the yard on the monitor.
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Operation of signal gear through multiple VDUs can occur simultaneously.
Operation of signal gear through multiple VDUs can occur simultaneously.
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The current status of field equipment is displayed using a single color on the VDU screen.
The current status of field equipment is displayed using a single color on the VDU screen.
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The EI system must comply with SIL-4 as defined by the CENELEC Standards.
The EI system must comply with SIL-4 as defined by the CENELEC Standards.
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Any software used in EI does not need to conform to recognized standards for safety critical applications.
Any software used in EI does not need to conform to recognized standards for safety critical applications.
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Independent validation of the EI system is unnecessary if it follows equivalent international standards.
Independent validation of the EI system is unnecessary if it follows equivalent international standards.
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A certificate from an Independent Safety Assessor is essential to validate compliance with SIL-4.
A certificate from an Independent Safety Assessor is essential to validate compliance with SIL-4.
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The firm must document all modifications made to the EI system after initial validation.
The firm must document all modifications made to the EI system after initial validation.
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User Railway is responsible for the independent verification of EI system's standby changeover software.
User Railway is responsible for the independent verification of EI system's standby changeover software.
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The application software related to yard data does not need to be verified by the User Railway.
The application software related to yard data does not need to be verified by the User Railway.
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The EI system can be validated based on standards that are not recognized by safety standards bodies.
The EI system can be validated based on standards that are not recognized by safety standards bodies.
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The Point and Signal modules must interface with Signals and point machines per IRS/S/24 without amendments.
The Point and Signal modules must interface with Signals and point machines per IRS/S/24 without amendments.
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Outdoor gears interface requirements are provided by the purchaser.
Outdoor gears interface requirements are provided by the purchaser.
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Relay driver modules are used to drive other field gears through a direct interface.
Relay driver modules are used to drive other field gears through a direct interface.
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Surge protection is optional if the field gear is directly driven from the OC.
Surge protection is optional if the field gear is directly driven from the OC.
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The medium of communication between CIU and OCs is RDSO approved Mono-mode OFC.
The medium of communication between CIU and OCs is RDSO approved Mono-mode OFC.
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All outputs shall be brought to a safe state in case of communication failure between CIU and OC.
All outputs shall be brought to a safe state in case of communication failure between CIU and OC.
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Communication devices connecting Central EI with Object controllers need not meet any specific safety standards.
Communication devices connecting Central EI with Object controllers need not meet any specific safety standards.
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A network monitoring system is instituted to check the perfection of the OFC network connection.
A network monitoring system is instituted to check the perfection of the OFC network connection.
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Study Notes
Document Information
- Document Number: RDSO/SPN/203/2011
- Document Title: SPECIFICATION FOR ELECTRONIC INTERLOCKING FOR BIG YARDS
- Version Number: 1
- Date Effective: 13/09/2011
- Number of Pages: 24
- Prepared By: SE/Signal
- Checked By: DD/Signal-III
- Issued By: Director/Signal-III
Scope
- Covers Electronic Interlocking (EI) for big yards
- Primarily for stations with >200 routes, and high reliability requirements
- EI can also be used in stations with fewer routes and many signaling input/output functions
Applicable/Reference Documents
- Various Indian Railway Standards (IRS) and RDSO specifications are referenced
- Includes standards relating to interlocking systems, electrical signaling, safety, reliability, EMC, and environmental testing
Terminology
- Definitions as per latest versions of IRS: S23 and RDSO/SPN/144 are used
Abbreviations
- Many abbreviations, such as CIU (Central Interlocking Unit), AFTC (Audio Frequency Track Circuit), ATP (Automatic Train Protection), etc., are defined
Functional Requirements
- Meets station's interlocking requirements (per approved plan and selection table)
- Includes cascaded signal control
- Provides audio-visual alarms for various situations
Technical Requirements
- Microprocessor-based interlocking equipment
- Reads yard inputs, processes, and generates outputs
- Provides fast response time (under 5 seconds) for complex routes
- Complies with Indian Railways standards, such as Signal Engineering Manual (SEM) & G&SR
System Architecture
- Two out of two or two out of three hardware architectures with identical or diverse software options are supported
- Redundancy is incorporated into the design for fault tolerance
Software Requirements
- Executive software defines system functionality
- Application software contains station-specific logic
Object Controller
- Processor-based, communicates with the Central Interlocking Unit (CIU)
- Drives field gears (points, signals, relays)
- Implements fail-safe operation
Control Terminal
- Includes a VDU (Visual Display Unit) monitor displaying yard status
- Redundant hot standby mode is available
- Multiple screens, if required, can show separate sections of the yard
- Includes communication with Central Interlocking Unit and the Object Controllers
- Uses Optical Fiber Cable (OFC) with isolators between systems
Protection Systems
- Shields from electromagnetic and electrostatic interference
- Includes provisions for short-circuit and overvoltage protection and surge protection
Safety Requirements
- Conforms to CENELEC SIL-4 standards for safety-critical applications, including software and hardware
- Meets international safety standards if a different standard is used
- Includes validation from an independent safety assessor, including software validation
Maintenance Aids
- Includes a maintenance terminal (MT)
- MT provides monitoring, storage, and displays of recorded events
- MT is connected to the interlocking through OFC for data transfer and diagnostics
Information/Documents
- Manufacturers must provide detailed specifications including design approaches, software details, and environmental/safety data
- Includes details such as installation, power requirements, components, test equipment, and maintenance aids.
Warranty and Availability Requirements
- Three-year warranty from equipment commissioning
- Ensure high system availability: 99.98% or better
Tests and Requirements
- Requirements for various types of tests, such as visual inspection, insulation resistance, functional and system-level tests
- Detailed procedures for each test stage
Acceptance Tests
- Tests are conducted to ensure compliance with the specifications
- Acceptance tests are conducted on a specific piece of equipment, for a full system, or a complete section
Quality Assurance
- Robust quality assurance measures are employed throughout the design, production, and testing phases
- Documentation of the quality assurance procedures is a required part of the submission.
Plant and Machinery
- Includes requirements for essential equipment for the installation and management
- Outsourced resources are permitted if approved by the RDSO
Packing
- Packing specifications that ensure a secure transportation process are included
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Description
This document outlines the specifications for Electronic Interlocking (EI) systems designed for big railway yards. It has a focus on high reliability for stations with over 200 routes while also being applicable for those with fewer routes. The standards referenced include various Indian Railway Standards and RDSO specifications.
