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इरिसेट
विद्युत वसगनव िंग प्रयोगशा ा प्रयोग सिं : एमटीडबू्ल्यएसएम2 – 09
IRISET
ELECTRICAL SIGNALLING LABORATORY
EXPERIMENT NO.:MTWSM2 - 09
नाम Name : _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
अनुक्रमाांक Roll No : _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
पाठ्यक्रम Course : _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ दिनाांक Date : _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
प्राप्ाांक
Marks Awarded : अनुिेशक का आद्याक्षर Instructor Initial :
STUDY OF COMMUNICATION NETWORK OF WESTRACE MARK-II DISTRIBUTED ELECTRONIC
INTERLOCKING SYSTEM AND COMMUNICATION FAILURES
Westrace Mark-II Electronic Interlocking System is a fail-safe Interlocking system designed
to meet CENELEC SIL-4 Standards. Mark-II system can be configured as centralized or as well as
distributed interlocking system. It is very much suitable for distributed type electronic interlocking
system. It is very much effective in Auto section / IBH concept of signalling. It is based on Two Out
of Two (2oo2) architecture with a hot standby provision and automatic change-over facility.
Westrace Mark-II system comprises of Processor Modules (PM), Parallel Input Modules
(PIMs) and parallel output modules (ROMs). All the modules are placed in westrace housings (10
slot housing).In distributed configuration housings are placed in different locations/ cabins. In each
location one or more housing may be placed according to the requirement but PM will be placed in
any one of the housing.
PM manages vital and Non-Vital interlocking Logic processing, diagnostics and
communication. Every Westrace System requires at least one PM. TWO PMs may be connected in
Hot-standby for availability.
PIM Module Receives input status from external gears and sends to PM for processing. Two
PIMs may be connected in hot-standby for improved availability, in Indian Railway (IR) Single PIM
is used for reading inputs.
ROM Module receives the processing data from PM and drives the external gears. Two ROMs
may be connected in hot-standby for improved availability, in Indian Railway (IR) Single ROM is
used for driving outputs.
Distributed configuration, IO modules placed in various housings. Housings may be placed in
different locations/cabins. In each cabin one or more housing may there, PMs are placed in any
one of the housing that controls entire cabin. In Distributed configuration PMs in any one of the
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location/ cabin controls all other housings, operator VDU (WESTCAD), Maintenance VDU
(MoviolaW) and Data Logger.
Application Data is loaded in the PMs which control all other modules. Application Data is the
combination of the system configuration and a set of Boolean logic statements that define the
working of a specific WESTRACE interlocking. All other housing PMs loaded with system
configuration data only.
Westrace Mk2 system Modules interconnection
Westrace Mark-II system I/O modules in housings can connect via a Serial Module Bus or via
Ethernet. Serial Module Bus (SMB) used for connection of all I/O Modules of different housings
within the cabins. Ethernet is used for connection of I/O modules of one cabin with other cabins.
Serial Module Bus Communication:
The Serial Module Bus (SMB) is used for local communication between a PM and IO modules.
The SMB is part of the PM Backplane within the housing. SMB can be connected to other
housings within the cabin for intercommunication. The SMB can be connected to IO modules in
other housings by wired connection.
Housing backplane consist of 4 SMBs named as SMB-A, SMB-B, SMB-C and SMB-D. Each
SMB supports RS-485 serial interface and it can connect up to 32 modules including the PM.
Usually dual SMBs are used to connect the IO modules to their PM within the Housing backplane.
System working single SMB is sufficient, redundant SMB is used for high system availability.
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An extra pair of SMBs (SMB-C and SMB-D) is used for increasing capacity, performance or
geographical reasons. SMB-C and SMB-D connect only to slots J1 and J2 (the PM locations if
PMs are fitted), and each is brought out to just one DB9-F connector.
SMBs can be daisy-chained to connect multiple housings. Single PM can address Up to 128
modules (including the PM itself) and PM can address Up to 64 housings (including its own).
A PM in slot 1 or 2, using 4 SMBs, could control 127 IO modules (1 PM and 127 IO modules).
This configuration would not have a redundant SMB available so it is not recommended.
SMBs are normally used in pairs (for redundancy) — SMBs A and B together, and SMBs C and
D together. In this configuration, the PM supports 32 modules on each SMB pair, i.e. 64 modules
total (e.g. 62 IO modules plus the PM and its hot-standby partner).
Each end of each SMB requires a terminator, even if the SMB is not used. Termination plugs
must always be used in the final ports of SMB-A and SMB-B. The plugs are required for SMB-A
and SMB-B whether or not the SMB is extended across multiple housings.
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SMB Terminators
Housings Interconnection using SM
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Ethernet Communication:
PM uses Ethernet to communicate with remote housings, WESTCAD, MoviolaW, VLM6
westrace, Datalogger and other westrace sub-systems. Ethernet ports are provided in PM Backplane
card.
Westrace MK-2 uses one or two10/100 Base-T Ethernet networks. Each PM has two independent
network ports for connection to Ethernet Network. Redundant ports increase the communications
availability. Network may include redundant paths to improve system availability.
Westrace Mk-2 PMs and other westrace systems (Mark-I and Mark-II) are interconnected by
10/100 Mb/s Ethernet using WNC (Westrace Network Communication Protocol), WNC+ (Enhanced
WNC) protocols on redundant interface. Westrace Mk-2 PMs and WESTCAD are interconnected by
10/100 Mb/s Ethernet using WSA/S2 or Modbus TCP protocols. Westrace Mk-2 PMs and MoviolaW
are interconnected by 10/100 Mb/s Ethernet using diagnostic protocol.
Wide Area Network (WAN) Components: Distributed configuration system Westrace Ethernet WANs carry communication between PMs,
between PMs and MoviolaW, WESTCAD and Data Logger.
Westrace Housing rear side PM Backplane card fitted, when PM inserted into slot PM interfaces
with housing back plane and PM Backplane. Housing back plane consists of SMBs for
intercommunication of cards within the housing.
PM Backplane contains the Ethernet Three Ethernet ports, Flash memory, and PM hot-standby
connectors. Ethernet ports on PM named as J1, J2 and J3. PORT J1 and J2 are used for PM
communication with External Devices. Port J3 used for interconnection of PMs in a hot-standby pair.
Port J3 is used for data transmission between Active and Standby PMs.
The Ethernet WAN transfers vital data to other vital equipment, and between westrace interlocking
modules. To extend beyond the location, Ethernet would typically be connected to a Local hub or
switch, or to an external network (routers, line interface, redundant links etc.).
The Ethernet network used by westrace Mk2 systems is made up using industrial grade
components. To Extend beyond Location Ethernet ports connected to industrial grade Ethernet
switches. Industrial grade Ethernet switch interfaces are provided with Ethernet interface and optical
interface. Ethernet interface is used for local communication between modules; optical interface is
used for remote module communication.
Westrace modules are connected in redundant routes with a ring topology using Ethernet and
OFC links. The use of the routes is typically determined by an intelligent network switch or router. The
switch or router will often automatically select an alternative route if the currently used one fails.
Communication status of Ethernet switches indicated through LEDs.
DATALOGGER CONNECTION:
• External Data logger connected to PM using Protocol convertor.PM sends Logged
information to External Data logger in predefined intervals.
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• Protocol Convertor Used in westrace provided with Ethernet and Serial Interface. Ethernet
interface is used for communication between PM and Protocol convertor. Serial interface
used for communication between protocol convertor and Data Logger. Data logger
Connection with PM is shown in the Station configuration diagram
PROCESSOR MODULE – COMMUNICATION INDICATION STATUS
Serial module Bus A,B,C and D status LEDs:
Flashing green = SMB COMMS OK
Red = SMB COMM error, Link failed or not used
(Inactive PM: all SMB LEDs unlit)
Processor Run LEDs (left column)
Indicates the health of vital processors A and B, and non-vital processor D:
Flashing red = Boot, initialisation and APPDEL phases
Flashing green = Operational Mode (PM healthy)
Unlit = otherwise
Processor Ready LEDs (right column)
Indicates the status of processor A and B application data transfer:
Red = Processor loading application data
Green = Processor has received application data.
Processor D Ready LED is reserved for future use
Hot-stand by PM-PM Link status LEDs (left column):
Green = Hot standby 100 Mbps link between PMs
Yellow = Hot standby 10 Mbps link between PMs
Unlit = Otherwise
Hot-standby PM-PM Activity status LEDs (right column):
Flashing Yellow = Data frame reception or transmission between Hot standby
PMs
Unlit = Otherwise
Ethernet Link status LEDs (left column) for network A and network B:
Green = 100 Mbps link exists
Yellow = 10 Mbps link exists
Unlit = No link
Ethernet Activity status LEDs (right column) for network A and network B:
Flashing Yellow = Data frame reception or transmission
Unlit = Otherwise
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Typical Distributed System Configuration Diagram with Dual VDU
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COMMUNICATION MODULES USED IN WESTRACE MARK-II SYSTEM
RUGGEDCOM SWITCH RS-900:
RS900 is a Managed Ethernet switch specifically designed to operate reliably in electrically harsh and
climatically demanding environments. The RS900 provides a high level of immunity to electromagnetic
interference and heavy electrical surges. The RS900 normal working voltage is 24V DC. Switch having
dual-redundant power connections, reversible polarity protection. RS900 advanced networking features
makes it ideally suited for creating Ethernet networks for mission-critical, real-time, control applications.
RS900 provided with 6 Ethernet ports (10/100Base-T) and 2 optical ports. Communication and Power status
indicated through LEDs provided on switch.
1. POWER LED
2. ALARM LED
3. RESET Button
4. Fiber Optic (100Base-FX) Ports
5. Copper (10/100Base-TX) Ethernet Ports
6. RS232 Console Port (Serial)
7. Failsafe Alarm Relay
8. Chassis Ground Connection.
9.Power Supply Terminal Block
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Review Questions Q1.Draw Distributed EI system configuration diagram for a station- having four cabins, Dual VDUs
used for controlling station and MoviolaW & Data logger placed in Central cabin ?
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Q2.South cabins S1 home signal cleared for Main Line, after clearing the signal north cabins both
PMs Losses communication with central cabin. What is the condition of S1 signal and note all the
observations on VDU?
Q3. Central cabin System1 is in ONLINE. North cabins S30 signal cleared for up loop line, after
clearing the in Central cabin System1 PM failed. What is the condition of the signal and note all
the observations on VDU?
Q4. Central cabin System1 PM is in ONLINE, system2 PM is in failed condition. After clearing the
North cabins signal, north cabins system1 PM card is failed. What is the condition of the signal
and note all the observations on VDU?
Q5. How External Datalogger is connected to Processor Module?
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Q6. How to find the communication status of between Ethernet switch and Processor Module?
Q7.How to find the communication status between two cabins? Q8. After clearing a signal in particular cabin, Communication lost between Active PM and Standby.
What is the condition of signal? Q9. How to find the communication status of MTVDU with Logic sub rack? Date: Signature of the trainee
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