Page 515 - IRSEM_Main Book

21.4.7 Version Control of Softwares of Electronic Interlocking

(a) Version of the Generic System software and hardware shall be approved
and controlled by authority competent to approve the Electronic
Interlocking system and its specifications.

(b) Version and checksum of the Application logic (station specific logic) shall
be unique for the installation and shall be approved by the authority
competent to approve the circuit diagrams. Corresponding Checksum shall
be recorded and controlled by the same authority.

(c) Version number and Checksum shall change whenever any modifications
are carried out to the Application logic (site specific logic).

(d) A proper record of Checksums shall be maintained at Station, Divisional
Headquarters and Zonal Headquarters as a part of completion
circuitdiagrams.

Section 5: Installation & Testing of Electronic Interlocking

21.5.1 Installation of Electronic Interlocking

(a) Installation of Electronic Interlocking system shall be done as per
approved guidelines and technical advisory notes issued from time to time.

(b) Application logic (site specific logic) shall be verified for safety and
functionality by carrying out exhaustive safety and functionality tests by
officers authorized by PCSTE.

(c) Only approved application logic with specified checksum shall be used in
the E.I system and this data and checksum shall be version controlled and
preserved by the Railways.

(d) Electronic Interlocking is required to be provided in dust proof cabinets of
approved type having transparent front door.

(e) Interface Relays, where provided, shall be of approved type and contacts
should be paralleled as far as possible for better reliability.

(f) Wherever possible, the spare input/outputs shall also be wired from E.I
cards up to Wago terminals for ease of carrying out future alterations.

(g) The input and output cables of E.I shall be twisted to minimize EMI & EMC
effect.

(h) Electronic Interlocking system shall be installed closer to Operator Room,
preferably adjacent room. Track crossing should be avoided between main
E.I system and operator room.

(i) The Electronic Interlocking room shall be provided with tiles or similar
arrangements on floor and walls to avoid periodic painting of walls and
resultant dust.

Chapter 21: Relay & Electronic Interlocking Page 458 of 535