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?

Blinking green LED Signup and view all the answers

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

Non-resettable counters Signup and view all the answers

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

A specific mark or color change Signup and view all the answers

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

Manual switch or password Signup and view all the answers

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

Verification by traffic personnel is essential Signup and view all the answers

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

To maintain the last controlled position of points Signup and view all the answers

Which feature prevents operation when the point is mid stroke?

Mid stroke point reversal preventing feature Signup and view all the answers

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

Of an approved type Signup and view all the answers

How can Electronic Interlocking Systems be monitored?

From both centralized and distributed locations Signup and view all the answers

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

It must conform to approved specifications Signup and view all the answers

What logic requirements apply to the Electronic Interlocking system?

Interlocking application logic specified for Relay Interlocking Signup and view all the answers

How can the application logic for interlocking be modified?

With an approved type of user interface Signup and view all the answers

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

Interface through relays or electronic modules of approved type Signup and view all the answers

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

It must be site-specific and verified for safety. Signup and view all the answers

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

Dust proof cabinets with a transparent front door. Signup and view all the answers

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

It must conform to the highest level of safety integrity. Signup and view all the answers

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

Twisted cables are recommended to minimize EMI & EMC effects. Signup and view all the answers

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

It does not require redundancy. Signup and view all the answers

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

It must be of appropriate size to display the layout in well-proportioned dimensions. Signup and view all the answers

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

Close to the Operator Room, preferably in the adjacent room. Signup and view all the answers

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

Spare input/output should be wired from E.I cards to Wago terminals. 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?

Drop-down menus or other approved means. Signup and view all the answers

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

Physical 'SM Key' in a separate box. Signup and view all the answers

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

Control Panels shall not be used in future installations. Signup and view all the answers

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

Arrangements for Yard Signalling and Interlocking. Signup and view all the answers

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

Route setting type using dropdown menu or entry/exit control. Signup and view all the answers

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

Block all signals and operations Signup and view all the answers

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

120 seconds Signup and view all the answers

Which configuration types can the Electronic Interlocking system be of?

Centralised or Distributed Signup and view all the answers

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

Record of Checksums Signup and view all the answers

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

Whenever modifications are made Signup and view all the answers

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

Hot-standby arrangement Signup and view all the answers

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

Time synchronization Signup and view all the answers

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

Competent authority Signup and view all the answers

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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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.