GE IS200VCRCH1BBB Discrete Input/Output Processor Board

The GE IS200VCRCH1BBB, also cataloged as the IS200VCRCH1BBB Discrete Input/Output Board, serves as the primary VCRC I/O Processor Board utilized to execute discrete signal processing and relay state execution across Mark VI Turbine Control System platforms.

Hardware Specifications

Backplane Bus Communication Velocity & Network Synchronization

Designed for high-density I/O integration within VME rack enclosures, the VCRC board delivers deterministic backplane bus communication velocity across single-slot backplane architectures. Unlike dual-slot processor designs requiring daughtercards, this module executes high-speed signal processing on a single printed circuit board layer. In Triple Modular Redundant (TMR) control topologies, input excitation signals fan out across dedicated JR1, JS1, and JT1 connectors directly to R, S, and T rack backplanes, eliminating voting delay and maintaining synchronized firmware flash compatibility during transient fault conditions.

Frequently Asked Questions

Q: How does the VCRC board process contact inputs in a Triple Modular Redundant (TMR) system layout?

A: In TMR configurations, discrete contact input signals from the TBCI terminal board are split and routed via front-panel JR1, JS1, and JT1 connectors to three independent VME controller racks (R, S, and T) to execute software 2oo3 voting logic.

Q: What are the primary functional differences between the single-slot VCRC and dual-slot VCCC boards?

A: The VCRC occupies a single VME rack slot by eliminating the hardware daughterboard found on the VCCC. Additionally, the VCRC locates its TBCI terminal connectors (J33 and J44) on the front faceplate and does not support TICI board interconnections over J3 and J4 connectors.

Q: Do varying excitation voltage ratings on connected TBCI terminal boards impact VCRC processor operation?

A: No, variations in TBCI excitation voltage levels do not alter the internal electrical operation or signal processing of the VCRC processor card.

Field Installation Guidelines

1. Power down the targeted VME rack and verify that all system backplane power supplies are de-energized prior to inserting or seating the VCRC card into the chassis slot.
2. Align the top and bottom Eurocard guide rails, slide the board firmly into position until rear backplane pin connectors engage, and lock the upper and lower faceplate ejector levers.
3. Torque faceplate retaining screws to 0.8 Nm to secure the mechanical ground path between the board front panel and the grounded VME rack frame.
4. When connecting external field wiring via J33 and J44 cables, secure cable strain reliefs to prevent mechanical stress on front-panel header pins and maintain single-point shield termination to isolate low-voltage logic from external industrial surge voltages.