Page 183 - IRSEM_Main Book

(c) The Route setting shall be on "Entry/Exit" principle for installations of
Route Setting type. Each route shall be controlled by means of two push
buttons-one at the entrance and the other at the exit of the route. In Non-
route setting type installations, after setting of the route by individual
operation of points is completed, signal can be cleared by an individual
push button in conjunction with a group button or by an individual switch
controlling each signal or a common switch for conflicting signals which
are not required at the same time, or one push button at the entrance and
other at the exit end.
(d) SM’s Key control arrangement shall be provided on Control panel/VDU, to
prevent any unauthorised operation.

(e) Provision for emergency route release shall be provided on control
panel/VDU. This emergency operation shall be recorded through a Non
resettable Counter incrementing for every such operation.

(f) All Emergency operations shall be two-step process, to safe guard against
unintended operations.

(g) Locking and sealing arrangements shall be provided for the covers of Control
Panels/Block Instruments etc. to secure against unauthorised opening. Relay
Rooms at stations shall be provided with double lock arrangements.

Further details are given in Para 21.1.2

7.7.3 Arrangement for switches/buttons for operation of points &signal in Control
Panel is given at Para 21.1.3.

7.7.4 Control Panel Indications: The control panel shall be provided with; Point
Indications, Route Indications, Signal Indications, Track Circuit Indications,
Power Supply Indications and other Indications as required. Refer to Para
21.1.4 for details.

7.7.5 Control Terminal – (Video Display Unit (VDU)):

(a) Control Terminal/multiple Control Terminals shall be of appropriate size to
display layout of the Yard in well-proportioned dimensions and shall
display all functions clearly distinguishable. Control Terminal/multiple
Control Terminals shall be provided in redundant mode.

(b) Operation of Signals, Points and other Controls such as Gate, Crank
handle, Siding, Slot etc. shall be carried out through appropriate
dropdown menus or other approved means.
(c) When embedded block working in Electronic Interlocking is used, all
indications like TGT, TCF, LC etc required for block working shall also be
displayed.

(d) Same indications as given in Para 7.7.4 above for Control panel, shall be
provided for Control Terminal also.

Further details on Control Terminal (Video Display Unit (VDU)) are given at Para
21.1.15.

Chapter 7: Essentials of Signalling Page 152 of 535