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Medha’s Electronic Interlocking System MEI 633 is a fail-safe, state-of-the-art Distributed Interlocking System. The System has been designed to CENELEC Standards to meet SIL-4 safety specification. It is based on two out of two architecture with a hot standby provision and automatic change-over facility. The System provides all the Interlocking features including Route Setting, Route Release, Point Operation, Track Occupancy Monitoring, Overlap Protection, Crank Handle Operation, Level Crossing Gate Interlocking, and provision for Block working.

Central Interlocking Unit (CIU) uses two-out-of-two architecture with two independent channels computing the vital interlocking logic and a supervisory processor monitoring the two vital computing channels. Hot standby with automatic change-over facility is provided. Redundant communication channels to Object Controller (OC) and Panel Processor (PP) are provided through two communication processors. OFC interface with ring configuration is used for communication between CIU and OC and CIU and PP.

Object Controllers (OCs) control the field gear through fail-safe signaling relays. CIU supports up to 32 OC units. Each OC can handle 24 vital outputs and 40 vital inputs. Each OC has two communication modules for redundancy. Each OC has 8 Wayside Function Modules (WFMs), each capable of handling 8 vital inputs or 8 vital outputs. WFM uses two-out-of-two architecture with two independent channels handling Vital input / outputs.

Panel Processor (PP) provides the interface between Operator's panel and CIU. Windows based graphical user friendly Application Data Generation tool suite with high level of automation is provided for generation of yard specific Application data. The tool suite also provides the facility for reverse compilation and relay diagram generation for easy verification of Application data.

Maintenance Terminal provides a diagnostic interface through online and off-line event, fault and yard status display with date and time stamps. It records all the events and faults for later off-line analysis.

Central Interlocking Unit (CIU)

2002 architecture with 100% hot standby and automatic changeover
Provision to expand the capacity by cascading two EI systems

Object controller (OC)

Can handle up to 2048 I/Os
32 object controllers can be connected to on CIU

Visual Display Unit (VDU)

Operator can issue commands using simulated buttons on the VDU screen
Sends the commands and receives the yard status and displays the same

Vision & Mission

To be World Leader in Railway Products

Enjoying Innovation and Applying Technology for improving the lives of people.
Enhancing the image of India in the world, in high technology.

R & D Centre

Behind Mint Compound, Cherlapally, R.R.Dist,
Hyderabad - 500 051 Telangana, India.
Phone: +91-40-6723 7000; Fax: +91-40-2726 4144

Corporate Identity Number:  U31103TG1984PTC004436

MEDHA SERVO DRIVES PVT. LTD. P-4/5B, IDA, Nacharam, Hyderabad - 500 076 Telangana, India
Phone: +91-40-2717 1101; Fax: +91-40-2715 4706