The GE IS200VCRCH1BBB, also cataloged as the IS200VCRC Discrete Input/Output Board, operates as a dedicated hardware component for discrete signal processing and relay actuation within Mark VI turbine control system racks. Occupying a single chassis slot, the module manages 48 contact inputs via TBCI terminal boards alongside 24 relay outputs interfaced through TRLY terminal boards.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | IS200VCRCH1BBB |
| Brand | GE (General Electric) |
| Origin | USA |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | VME backplane powered |
| Series | Mark VI IS200 |
| Product Type | Discrete Input/Output Processor Boards |
| Functional Acronym | VCRC |
| Discrete Inputs | 48 Contact Inputs (interfaced via TBCI) |
| Output Capacity | 24 Relay Outputs (12 Solenoid / 12 Dry Contact via TRLY) |
| Front Panel Connectors | J33 and J44 contact input connectors |
| Documentation Reference | GEH-6421 Volumes I and II |
Backplane Bus Architecture and Deterministic Latency
The IS200VCRCH1BBB interfaces directly with the Mark VI VME rack rack plane, enabling backplane bus communication velocity capable of real-time discrete state scanning across high-density I/O channels. In contrast to dual-slot legacy configurations such as the VCCC board, the single-slot VCRC architecture integrates signal processing hardware without requiring an external daughterboard. The onboard processor coordinates input state filtering for all 48 contact loops while simultaneously managing output drive switching logic for the 12 solenoid and 12 dry contact relay channels, maintaining deterministic synchronization with the main turbine control software routines.
Frequently Asked Questions
Q: Where are the primary contact input cable connectors physically located on the module?
A: The contact input connectors, designated as J33 and J44, are located directly on the front faceplate of the board.
Q: How does the physical slot footprint of the VCRC board compare to the VCCC variant?
A: The VCRC board utilizes a single VME rack slot because it lacks a daughterboard, whereas the VCCC board occupies a dual-slot footprint.
Q: What external terminal blocks are required to field-wire the 48 inputs and 24 outputs?
A: The 48 contact inputs route to the TBCI terminal board, while the 24 relay outputs interface through the TRLY terminal board.
Field Installation Guidelines
- VME Backplane Insertion: Ensure power to the VME rack enclosure is completely de-energized prior to inserting or removing the IS200VCRCH1BBB module from the card cage.
- Front Panel Cable Connections: Secure the field input ribbon cables to connectors J33 and J44 on the front faceplate using retaining screws to prevent accidental disconnection.
- ESD Mitigation: Handle the circuit board using an anti-static wrist strap connected to cabinet frame ground to safeguard surface-mount microelectronics from static discharge.
- Wiring Separation: Route dry contact input cables away from high-voltage AC circuits and solenoid drive wiring to reduce electromagnetic coupling into the TBCI terminal interfaces.
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