VITAL / NON-VITAL INPUTs/OUTPUTs

Vital Inputs (from RS):

(i) Active Cab:

Local or Remote w.r.t. the Driver’s location.

(ii) Position of the Mode Selector:

ATP Mode, Restricted Manual Mode (RM) or Reverse Mode (REV) and OFF Mode.

(iii) Doors Closed and Locked.

Vital Outputs (to RS):

(i) Emergency Brake Relay (EBR).

(ii) Zero Velocity Relay (ZVR).

(iii) Door Enable

Non-Vital Inputs (from RS):

(i) Position of the Start Button:

Push position of the Start Button shall command departure of the

Train (in ATO Mode).

Non-Vital Outputs (to RS):

(i) Application of Service Brakes:

Service Brake Valve Relay opened or Closed. Open contacts of this Relay shall indicate that Service Brakes have been applied.

(ii) Motoring & Braking efforts.

(iii) Auto Door opening.

Sub-Systems in Signalling

Signalling sub-systems: what are they???

For a safe train operation, there are a few requirements.

Point Operating Module ( POM4)

POINT OPERATING MODULE (POM4)

Make: SIEMENS

It is used to control & monitor point machines.

Both 1Ø and 3Ø AC point machines can be controlled and monitored.

Signal Operation Module (SOM6)

SIGNAL OPERATION MODULE (SOM6)

Make: SIEMENS

 The SOM6 board is a directly fed or transformer-fed signal operating module that activates 

steady-light and flashing aspects of signal light units.

The signal light units is a generic term which could refer to signal lamps, halogen lamps 

and LED signal light units

The signal operating module can be used both in buildings and in outdoor cabinets.

Interlocking: Siemens Make

INTERLOCKING

Make: SIEMENS

INTERLOCKING HIERARCHY:

A SIEMENS IXL (Interlocking) could have a maximum of 10 Interlocking Areas, each having a dedicated SIMIS PC system.

INTERLOCKING AREAs

Each IXL area comprises a 2X2-out-of-2 SIMIS PC system enclosed in a SIMIS PC Cabinet.

Each PC can have 12 EOM ECCs (Element Operating Module- Element Control Computers).

So in a nutshell, a SIMIS PC controls the entire IXL area, eg: NFD, AVIT.

And each of the possible 12 ECCs control a select group of Signalling installations within the IXL Area.

Now lets move to the configuration of Simis PC (CPCI) / ECC computer cabinet . 

See the figure below:

Essentials of Interlocking

Before laying out the Essentials of Interlocking, lets just understand or refresh our knowledge  by the Definition of Interlocking:

"An arrangement of signals, points and appliances, operated from a panel or lever frame, so interconnected by Mechanical locking or electrical locking or both that their operation must take place in proper sequence to ensure safety".