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Meets CENELEC SIL-4 Safety Specification. |
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Can handle upto 2048 vital Inputs/Outputs |
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Modular System Design, which is scalable to suit the needs of a specific installation. |
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Time tested and Safety-proven Relay Based Boolean logic is used for Interlocking. |
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System can be operated using Domino Type Control Panel or PC based VDU Control Terminal. |
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Easy upgrade of Application Data in case of any Yard modification. |
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Provision to expand the Interlocking and IO capacity by cascading two EI Systems. |
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Can be configured as a Distributed or Centralised Interlocking System |
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Inherently Fail-safe Relay Driver used to drive the Vital Output Relays. |
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Highly Reliable and Standardised hardware |
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Modular System Design, which is scalable to suit the needs of a specific installation. |
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The number of Object Controllers, the number of Input and Output Modules in each OC, and the Input and Output modules required for the Panel Processor can be to selected to suit the Yard Interlocking Requirement. |
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A Single failure in any CIU module does not cause any change in the Vital Output States. The Faulty module is shut down and a Fault Message is generated. The System continues to work with the standby module. The faulty module can be replaced without interrupting the Yard Operation. |
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CIU can be connected to a maximum of 32 Object Controllers, each capable of handling a maximum of 24 Vital Outputs and 40 Vital Inputs. |
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Relay Based Boolean logic provides maximum flexibility to the User to design the Interlocking logic to meet any special Interlocking requirements for a specific installation. |
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VDU based Control Terminal provides Menu Driven Operation. Confirmation is taken from the Operator for Emergency Operations. Facility for Locking selected Operation is provided with Password protection. |
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System based on Cyclical operation whereby all inputs are updated, outputs are computed and updated every system cycle of 333ms. |
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Vital Outputs are continuously monitored through readback of Vital Relay Contacts. In case a Wrong Side Failure is detected, the Primary Negation is activated to drop the Vital Cut-off Relay, thus cutting-off the Supply to all the Vital Outputs of the faulty Object Controller. |
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Secondary Negation is provided in Central Interlocking Unit. If Vital Cut-off Relay fails to negate the wrong side failure, then CIU shuts down. |
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Isolation and Double Cutting arrangement is provided for the Vital Inputs and Vital Outputs. |
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All Vital Inputs and Outputs are provided with Reverse polarity, Surge, Overload and Short Circuit protection. |
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EMI/EMC and ESD Protection.. |
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Easy Maintainability is achieved by using high reliability hardware, modular design and extensive built-in fault diagnostics capability. |
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Maintenance Terminal provides the Event log information of both Active and Standby Interlocking Channels. |
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Internal Log of Events and Faults maintained by the CIU with Date and Time stamps. |
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Additional provision for connecting External Datalogger. |
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Fault Codes are displayed along with Fault Messages on the Front Panel Display housed in CIU Rack. |
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Independent Voltage and Health Monitoring provided for each redundant channel. |
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Three levels of Watchdog monitoring provided for all Vital Modules. |
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Software Safety provisions to protect Vital data integrity during communication as per CENELEC Standards for Safety-related Communication in Closed Transmission Systems. |
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Extensive built-in Periodic Self-checks of Hardware and Software Integrity. |