Mais conteúdo relacionado Semelhante a Webfil digital _ fail safe multiplexer __ ufsbi for sge (20) Webfil digital _ fail safe multiplexer __ ufsbi for sge1. 7/6/2015 Welcome to WEBFIL : Digital :: Fail Safe Multiplexer :: UFSBI for SGE
data:text/html;charset=utf8,%3Ctable%20border%3D%220%22%20cellpadding%3D%220%22%20cellspacing%3D%220%22%20width%3D%22610%22… 1/4
SGE DOUBLE LINE USING UFSBI
Introduction
The Universal Fail Safe Block Interface Equipment UBX 2000 is meant for
interfacing various signaling information of a block instrument at one end
of a block section and exchanging them with the block interface equipment
at the other end through a digital transmission equipment (optical or radio)
ensuring high degree of safety and availability.
Safety of a block instrument is ensured by a foolproof logic sequence and relay interlocking. Safety for the
Block Interface Equipment means it must correctly acquire the signal and reproduce it at the other end without
any error. In case of any failure, it is detected and the system is lead to a fail safe state.
However, there are some very remote possibilities when t he system may not be able to detect a failure which
may lead to an unsafe situation. This is defined as Mean Time between Wrong side Failure (MTBWSF) and
according to RDSO specification SPN 147/2005, the figure is 10 9 hrs. This can be very well ensured by using
2 out of 3 hardware redundancy logic at the I/O Interface and processor level. With 2/3 redundancy system, as
soon as an anomaly is detected, the system is forced to a fail safe state leading to a RED signal. Mishaps are
thus avoided, but the mov ement of the train is also restricted. To increase the availability of the system, thus
triple hardware redundancy has been proposed at the I/O interface and Processor level so that even if a
failure is detected in one set of hardware fail safe operation can still continue with 2 sets of hardware, thereby
increasing availability. Better availability is also ensured by using dual redundant power supply unit for the
system.
HIGHLIGHTS OF UNIVERSAL BLOCK INTERFACE EQUIPMENT UBX2000 :
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 SPN144 and SPN147/2005 for all types of Block Instruments in
operation in Indian Railways.
Simple, modular and rugged design.
High performance 16 bit Intel 80C196KC 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 errorfree data.
Dual power supply in hotstandby mode increases system availability.
16digit dotmatrix alphanumeric display for user friendly man machine interface.
2. 7/6/2015 Welcome to WEBFIL : Digital :: Fail Safe Multiplexer :: UFSBI for SGE
data:text/html;charset=utf8,%3Ctable%20border%3D%220%22%20cellpadding%3D%220%22%20cellspacing%3D%220%22%20width%3D%22610%22… 2/4
Environment specification meets IS9000.
SYSTEM OVERVIEW :
Safety and Availability are the two keywords which are reflected in all the stages of the system design.
The system is housed in a 19 inch subrack, 6U (10.5 inches) high, which is fixed inside a closed rack of
approx 5 ft high. The front panel of the closed rack is a hinged door fitted with transparent plastic sheet so as
to enable the operator to see the LEDs and displays of the system. The door is also provided with a lock to
protect the system from unauthorized access. The rear panel of the closed rack is normally fixed with screws.
The various cards which have been used in the system are as follows:
Power Supply Unit
System Module
Communication Driver Unit
Relay Input Interface Module
Relay Output Module
Relay Feedback Module
Display and Reset Panel
Alarm Extender Module
Alarm Panel For SM
The above modules are housed in a passive backplane which has the provision of accommodating 12
modules. The basic system consists of two power supply units connected back to back, three system units and
one communication driver unit. The above modules consume six fixed slots. The subsequent six slots are for
accommodating two nos. of each of Input, Feedback and Output modules. The last slot is not used.
The position of the power supply unit, the system unit and the communication driv e unit is fixed on the
backplane. To avoid insertion of wrong card in a slot, the connectors have relative offset so that only the right
card will be accepted in the right slot. Input, Output and Feedback module have fixed position on the
backplane.
The backplane accepts two input modules in slot 7 & 8, two feedback modules in slot 9 & 10 and two output
modules in slot 11 & 12. Input signals received through slot 7 will be output through slot 11 at the other end of
the UFSBI system. Feedback of output signal of slot 11 is taken through the feedback module of slot 9. Thus
the three cards of slot 7, 9 & 11 forms a composite set of first 8 input / output. Similarly the three cards of slot 8,
10 & 12 forms a composite set of rest 8 input / output.
The each of the I/O Modules has triple redundant hardware for the same external I/O signal to ensure the
safety and availability of the system. These I/O modules are interfaced to the three processors through three
separate universal I/O bus. The degree of saf ety specified is ensured not only by hardware but also by
software taking inputs and feedbacks from various stages of the system.
All the alarms and status of the system are displayed with various onboard LEDs on each of the modules.
Further a 16 character alphanumeric display panel/module is used to prompt the various alarm conditions
with short mnemonics for easy understanding of the problem. The display panel is fitted at the top of the
4. 7/6/2015 Welcome to WEBFIL : Digital :: Fail Safe Multiplexer :: UFSBI for SGE
data:text/html;charset=utf8,%3Ctable%20border%3D%220%22%20cellpadding%3D%220%22%20cellspacing%3D%220%22%20width%3D%22610%22… 4/4
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