Electronic Interlocking Requirements Quiz
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Questions and Answers

What is required to unblock a function in the emergency operations process?

  • Automatic approval from the system
  • No special requirement
  • Manual operation from the Control Panel
  • SM's key (correct)

How long must the time delay be before all functions are un-blocked by the 'All Un Block' option during E.I start-up?

  • 60 seconds
  • 30 seconds
  • 90 seconds
  • 120 seconds (correct)

What must be done to operate points when the interlocking is free?

  • Complete a system checklist
  • Check the weather conditions
  • Ensure all track circuits are clear (correct)
  • Obtain a special key from the control room

What indicator shows that the E.I system is healthy?

<p>Blinking green LED (C)</p> Signup and view all the answers

What type of counters should be used while operating the Control Panel or Control Terminal?

<p>Non-resettable counters (D)</p> Signup and view all the answers

Which feature indicates blocking of a function on the Control Terminal?

<p>A specific mark or color change (B)</p> Signup and view all the answers

What allows the switching of controls from one Control Terminal to another?

<p>Manual switch or password (B)</p> Signup and view all the answers

What is a requirement for operating points when the point zone track circuit fails?

<p>Verification by traffic personnel is essential (C)</p> Signup and view all the answers

What is the purpose of the latch relay in point control circuits?

<p>To maintain the last controlled position of points (A)</p> Signup and view all the answers

Which feature prevents operation when the point is mid stroke?

<p>Mid stroke point reversal preventing feature (B)</p> Signup and view all the answers

What should the interface between the Control Panel and the Electronic Interlocking system be?

<p>Of an approved type (A)</p> Signup and view all the answers

How can Electronic Interlocking Systems be monitored?

<p>From both centralized and distributed locations (A)</p> Signup and view all the answers

What is required for the interface with external data logging equipment?

<p>It must conform to approved specifications (A)</p> Signup and view all the answers

What logic requirements apply to the Electronic Interlocking system?

<p>Interlocking application logic specified for Relay Interlocking (C)</p> Signup and view all the answers

How can the application logic for interlocking be modified?

<p>With an approved type of user interface (B)</p> Signup and view all the answers

What feature should be provided for the control of signals and points?

<p>Interface through relays or electronic modules of approved type (C)</p> Signup and view all the answers

What is required for the application logic used in the Electronic Interlocking system?

<p>It must be site-specific and verified for safety. (D)</p> Signup and view all the answers

What type of cabinets should be used for the installation of Electronic Interlocking systems?

<p>Dust proof cabinets with a transparent front door. (D)</p> Signup and view all the answers

What is a requirement for the Electronic Interlocking System concerning its safety integrity?

<p>It must conform to the highest level of safety integrity. (C)</p> Signup and view all the answers

What is the recommended practice for the installation of input and output cables in the Electronic Interlocking system?

<p>Twisted cables are recommended to minimize EMI &amp; EMC effects. (A)</p> Signup and view all the answers

Which of the following is NOT a condition that the Electronic Interlocking System must fulfill?

<p>It does not require redundancy. (B)</p> Signup and view all the answers

What dimension quality is required for Control Terminal displays in Electronic Interlocking installations?

<p>It must be of appropriate size to display the layout in well-proportioned dimensions. (D)</p> Signup and view all the answers

Where should the Electronic Interlocking system ideally be installed in relation to the Operator Room?

<p>Close to the Operator Room, preferably in the adjacent room. (D)</p> Signup and view all the answers

What additional wiring practice is recommended for future alterations in the Electronic Interlocking system?

<p>Spare input/output should be wired from E.I cards to Wago terminals. (C)</p> Signup and view all the answers

Which of the following is a method through which operation of signals and points is performed in Electronic Interlocking?

<p>Drop-down menus or other approved means. (D)</p> Signup and view all the answers

What protection facility is required for Control Terminals against unauthorized operation?

<p>Physical 'SM Key' in a separate box. (A)</p> Signup and view all the answers

Which statement is true regarding the installation of Control Panels in future Electronic Interlocking systems?

<p>Control Panels shall not be used in future installations. (D)</p> Signup and view all the answers

What type of interlocking arrangements must be in accordance with the approved Signal Interlocking plan?

<p>Arrangements for Yard Signalling and Interlocking. (D)</p> Signup and view all the answers

What is the installation type required for the Electronic Interlocking System?

<p>Route setting type using dropdown menu or entry/exit control. (C)</p> Signup and view all the answers

What should the Electronic Interlocking system do when an internal failure occurs?

<p>Block all signals and operations (C)</p> Signup and view all the answers

What is the minimum delay before releasing operations after powering up the Electronic Interlocking system?

<p>120 seconds (B)</p> Signup and view all the answers

Which configuration types can the Electronic Interlocking system be of?

<p>Centralised or Distributed (A)</p> Signup and view all the answers

What must be maintained as a part of completion circuit diagrams?

<p>Record of Checksums (C)</p> Signup and view all the answers

How often should the version number and checksum change for the Application logic?

<p>Whenever modifications are made (D)</p> Signup and view all the answers

What arrangement should the Electronic Interlocking system include to handle failures?

<p>Hot-standby arrangement (D)</p> Signup and view all the answers

What aspect must be synchronized in any configuration of the Electronic Interlocking system?

<p>Time synchronization (D)</p> Signup and view all the answers

Who approves the version control of the Electronic Interlocking system's software?

<p>Competent authority (C)</p> Signup and view all the answers

Flashcards

EI System Approval

The Electronic Interlocking (EI) system must be an approved type and meet the latest approved specifications.

EI Safety Integrity

The EI system must have the highest possible safety standards defined in the specifications.

EI Route Setting

The EI system's installation involves route setting through a dropdown menu or entry/exit control. Individual point operation is also supported.

Yard Signalling and Interlocking

The EI system's signalling and interlocking for the yard must align with the Signal Interlocking plan (SIP) and Control Table.

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EI Control Panel Usage

Control panels are not permitted for new EI systems. Existing ones remain usable.

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Control Terminal Size

Control terminals should show the yard layout clearly and display all functions prominently. Redundant terminals are often useful.

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Control Terminal Indications

Visual displays on the control terminal match control panel indications (if any) or other approved types.

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EI Redundancy

The EI system must have built-in backup systems and components to maintain operations even if one component fails.

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Emergency Operations

Emergency operations are a two-step process to prevent unintended operations.

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Non-resettable Counters

Non-resettable counters are used for keeping track of emergency operations.

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Control Terminal Features

Control Terminals offer individual blocking and unblocking features for signals, points, and line blocks.

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Control Terminal Unblocking Delay

To prevent system errors, unblocking of all components occurs after a minimum 120-second delay.

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Function Blocking Indication

A distinct mark or color on the terminal displays when a function is blocked.

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Control System Switchover

Switching controls between control panel and terminals is possible.

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System Health Indication

A blinking green LED or indicator on the control panel or terminal.

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Point Operation Restrictions

Points can operate only when interlocking is free and the relevant track circuit is clear. Emergency operation allowed after checks if track circuit fails.

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Point Control

Point operations are controlled by two output relays from separate E.I. output cards.

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Point Position Latch

The last controlled position of points is stored using a latch relay.

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Mid-Stroke Reversal

A feature to prevent point operations from starting while in mid-stroke or when trying a different position during movement.

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Embedded Block Indication

Electronic interlocking embedded blocks display relevant signals like TGT, TCF, and LC.

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Interlocking System Interface Types

Interfaces between control elements (points, signals, etc.) and the electronic interlocking system are via approved relays or modules.

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Centralized/Distributed Control

Electronic interlocking systems can be controlled and monitored from a centralized or distributed location, as per the site's need.

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E.I. Network Capabilities

Electronic interlocking systems can be networked for diagnostics or centralized control and monitoring purposes,potentially with other systems

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Application Logic Modification

The interlocking application logic can be modified using approved user interfaces for yard remodels or interlocking changes.

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EI System Installation

The installation of an Electronic Interlocking (EI) system must follow approved guidelines and technical advisory notes issued by the authorities.

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EI Application Logic Verification

The specific logic used in an EI system must be thoroughly tested for safety and functionality by authorized personnel.

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EI System Protection

Electronic Interlocking systems need to be protected from dust and other environmental factors, so they are typically installed in dust-proof cabinets.

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EI Room Design

The room housing the EI system should be designed to minimize dust and be located near the operator room, preferably in an adjacent room.

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EI System Wiring for Reliability

Interface relays, when used in EI systems, should be of approved type and have multiple parallel contacts for enhanced reliability.

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EI Power-Up State

When powered up, the Electronic Interlocking (EI) system initially restricts all signals and operations for safety. This blocking is released after a minimum of 120 seconds, allowing normal operation once the system verifies its safety.

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EI Hot Standby

An Electronic Interlocking system has a backup system always ready to take over in case of failure. This switchover happens seamlessly, without affecting the signalling status.

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EI Distributed Configuration

In distributed Electronic Interlocking setup, subsystems communicate via optical fiber cables, creating redundancy for both data and power supply.

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EI System Software Version Control

The core system software and its hardware configuration are approved by a designated authority. This ensures consistency and safety throughout the system.

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EI Application Logic Version Control

The station-specific application logic (rules for signals and points) has a unique version and checksum. These are verified and controlled by the authority to ensure accurate implementation.

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EI Checksum Record

Checksum values for each station are documented at various levels of the railway organization, including the station, divisional headquarters, and zonal headquarters. This ensures traceability and consistency.

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EI Software Modification

If changes are made to the station-specific logic, the version number and checksum must be updated. This helps track changes and ensures consistency.

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EI System Time Synchronization

All components of the Electronic Interlocking system must be synchronized in time to ensure accurate operation and coordination.

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Study Notes

Electronic Interlocking (El) Essential Requirements

  • Electronic Interlocking systems must conform to the latest approved specifications and have the highest safety integrity.
  • Systems must be suitable for both electrified and non-electrified sections.
  • Installation must be route setting type using dropdown menus or entry/exit controls for point operations.
  • Yard signaling and interlocking must align with approved plans and control tables.
  • Systems must be compatible with control panels or terminals.
  • Built-in redundancy is required per approved specifications.

Control Terminal (Video Display Unit (VDU))

  • Existing control panels (if provided) for Electronic Interlocking installations follow requirements of Para 21.1.1 and 21.1.2.
  • New installations should not use control panels, but use control terminals.
  • Terminals should display the yard layout in a clear, well-proportioned format.
  • All functions should be clearly distinguishable on the display.
  • Multi-terminal setups are recommended for redundancy.
  • Video display indicators should match control panel indicators as per Para 21.1.4 or other approved types.
  • Controls like gates, cranks, siding and slots must be operated via drop-down menus.
  • Terminals must have protection against unauthorized operation via a separate 'SM Key'.

Emergency Operations

  • All emergency operations require a two-step process to prevent unintended actions.
  • Only non-resettable counters are allowed when using control panels or terminals.
  • Terminals must include provisions equivalent to a control panel's signal, point, and line block collars.
  • A dedicated 'all unblock' feature is recommended for use during E.I start-up. This will un-block all lines/signals/points after 120 seconds.

Function Indication & System Health

  • Clear indications (using colour codes or different markings) are required for all functions on Control Terminals and Panels where they are present.
  • System health is indicated by a blinking green LED or similar indicator on the console.
  • Switchover between control panels and terminals (or multiple terminals) can be manual or password-protected.
  • Point operation needs interlocking to be free and relevant point track circuits clear. Emergency operation procedures include site verification before operation if point track circuits fail and a non-resettable counter for each such operation.

Electronic Interlocking Interface

  • Electronic Interlocking system interfaces must follow approved specifications and should allow for distributed or centralised control.
  • Interface with external data logging equipment is required.
  • Systems are capable of being monitored/controlled from either a centralized or distributed location.
  • Systems should be networkable for diagnostic and centralized control and monitoring purposes.
  • Interlocking application logic must adhere to existing relay interlocking standards.
  • Systems must be capable of modification when yard layouts change.
  • Wiring diagrams and standards can be found in a supplementary document.

Powering Up Electronic Interlocking

  • When powering up, the system must drive all necessary signals.
  • In the event of internal failure, the system will signal the most restricted aspects.
  • Upon startup, all signals and operations must be blocked.
  • This block must be removed after verification of all safety functions and delay of at least 120 seconds.

Configuration of Electronic Interlocking

  • Hot standby arrangements are required, ensuring no interruptions to signalling.
  • Systems can either be centralised or distributed, with redundancy in OFC communication media.
  • The system must synchronize time.

Software and Hardware Version Control

  • System software and hardware versions need approval and control.
  • Versions and checksums of application logic should be unique to each system and approved.
  • Modifications will require updated checksums.

Installation and Testing

  • Installation should comply with approved guidelines and advisory notes.
  • Functionality and safety of the system's application logic must be verified through tests conducted by authorized personnel.
  • Only approved application logic (with checksums) should be used in the system.
  • The system should be housed in dustproof cabinets with transparent doors.
  • Interfaces should be paralleled for improved reliability.
  • Wiring and cables must be routed to minimize electromagnetic interference.
  • The system should be placed near the operator room.
  • The installation area should be easy to maintain.

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Related Documents

Electronic Interlocking (EI) Requirements - PDF

Description

Test your knowledge on the essential requirements for Electronic Interlocking systems and their control terminals. This quiz covers safety standards, installation protocols, and the functionalities of Video Display Units in the context of Electronic Interlocking. Ensure your understanding aligns with the latest approved specifications.

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