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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