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BACK TO FAIL SAFE MULTIPLEXER
BPAC FOR SINGLE LINE USING UFSBI
Introduction
Block Proving by Axle Counter is a system used for controlling the
coordinated movement of the train in the block section working on
absolute block working principle. The system has been developed as per
RDSO/SPN/188/2004 Ver.1 for single line block working, replacing the
traditional single line block instruments.
HIGHLIGHTS OF BPAC FOR SINGLE LINE USING UFSBI (WEBFIL MAKE):
Designed for fail safe operation.
Triple redundant hardware at all levels with 2/3 decision logic ensures high degree of safety as well as
availability.
System meets CENELEC & ORE 155 guidelines for safety and reliability.
System meets RDSO specification no. RDSO/SPN/188/2004 Ver.1
Simple, modular and rugged design.
High performance 16 bit Microcontroller used for better software management.
CMOS/FET active components to ensure low power consumption and better reliability.
Hi­rel components, relays and connectors used to ensure high MTBF.
All input­output connections are optically and/or galvanically isolated to eliminate ground noise and
earth faults.
Rugged communication protocol for transmission of error ­free data.
Dual power supply in hot ­standby mode increases system availability.
16­digit dot­matrix alpha­numeric display for user friendly man­machine interface.
Environment specification meets IS ­9000.
SYSTEM OVERVIEW :
The Block Proving by Axle Counter is designed to replace existing block instruments, used in railway
signaling system. It is a subsystem of Block Proving system and it works with other subsystems mentioned
below:
Universal Fail Safe Block Interface
Block Panel
Single section Digital Axle Counter
Block Telephone
Quad Cable or Voice channel on OFC
Battery Set
Battery Charger / IPS module
Relay rack with relays
SALIENT FEATURES:
The BPAC is of 2 out of 3 hardware architecture with implementations of the fail safety principles. It complies
with the CENELEC standards and conforming to Safety Integrity Level ­ 4 (SIL­4).
The system incorporates auto features and eliminates manual co­operations from other end for ­
Line Clear operation.
Emergency cancellation at the receiving station.
Automatic Train On Line.
Automatic Line Close after sequence proved at receiving end.
Simplified Block Back / Block Forward Operations.
Cooperative Cancellation.
Station Master Key (SM Key) to prevent unauthorized panel operations.
Single Line working with provisions for shunting with shunt key EKT.
Data logger connectivity.
Communication media: (1 pair cable in quad or on voice channel in OFC.)
Block bell and telephone on separate pair of quad or voice channel of OFC.
TECHNICAL SPECIFICATION

2. SYSTEM
SPECIFICATION
Meets RDSO SPN 147/2005
SYSTEM
CONFIGURATION
Triple redundancy at all levels including processor
CENTRAL
PROCESSOR
Hight Performance 16 bit Intel 80C 196KC Microcontroller
SAFETY
COMPLIANCE
Hardware : CENELEC EN 50129
ORE 155.A
RSDO SPN 144 & SPN 147 / 2005
Software : CENELEC EN 50128
I/O MODULES
Input Module 16 change over input, Opto isolated with transient suppressor
Output Module 16Q series Relay output with 8F / 8B contacts
Transient protected
Short circuit protected
Note: Output module needs an Input module for getting feedback from the external signaling relay driven
by the system.
COMMUNICATION
FSK, V.23 1200 Baud
1302/2097Hz
4QAM V.22.bis 2400 Baud (not used)
Send level ­8 dBm nominal
Receive Level ­12 dBm nominal
S/N Ratio better than 20dB for BER 10­6
POWER SUPPLY
Configuration Hot­standby
Input 24 V DC nominal
21.6 V DC to 28.8 V DC
Output +5.8 V Dc, +­ 0.3 V, 1.5 AMPS (Int)
+12.8 V Dc, +­ 0.5 V, 4 AMPS (Int)
Consumption
20 Watts (nominal) for basic system
(excluding the activation drive of external signaling relays)
Protection
Input : Surge and transients, Overvoltage alarm, Over voltage shutdown,
Undervoltage alarm, Undervoltage shutdown
Output: Overvoltage and short­circuit
Efficiency >70% at optimum load
ENVIORNMENT QM333 Catagory B2
Temparature As per RDSO/SPN/147/2005
Humidity As per RDSO/SPN/147/2005
MECHANICAL
Sub­rack of UBX 2000 is 19" wide, 6U high
Closed Rack (standard) is 600mm wide, 32U high
Downloads
BPAC Single Line Installation Manual BPAC Single Line Maintenance Manual
Video

3.
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