IS200VCRCH1BBC - Discrete Input/Output Board

IS200VCRCH1BBC - Discrete Input/Output Board IS200VCRCH1BBC - Discrete Input/Output Board

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Part No.: IS200VCRCH1BBC
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
Max response time on: 25 ms
Max response time off: 25 ms
Relay contact material: Silver cad-oxide
Size: 10.25 in x 0.782 in x 7.375 in
Temperature: -30 to 65oC
Product Type: Discrete Input/Output Board
Availability: In Stock
Series: Mark VI

Functional Description

IS200VCRCH1BBC is a discrete input/output board developed by GE. It is a part of Mark VI control system. The Discrete Input/Output board, along with its associated daughterboard, facilitates the management of 48 discrete inputs and the control of 24 relay outputs, distributed across four terminal boards. This board is designed to fit into a narrower, single-slot configuration and is installed within the VME I/O rack. The rack is equipped with two sets of J3/J4 plugs to accommodate cables connecting to the TBCI (Contact Input with Group Isolation) and TRLY (Trip Relay) terminal boards.

Voltage Compatibility Considerations

  • In applications involving 240 V AC power, it is crucial to avoid inadvertent cross-connections between the 240 V AC and DC voltages.
  • Such cross-connections can lead to the peak voltage exceeding the Metal Oxide Varistor (MOV) rating, resulting in component failure.

Failure Mechanism

  • The majority of AC supplies operate with a grounded neutral. If an unintended connection occurs between the 125 V DC and AC voltages, the combined voltage, consisting of the AC peak voltage and the 125 V DC, is applied to MOVs connected between the DC and ground.
  • In 120 V AC applications, the MOV rating can withstand the peak voltage without causing failure due to the lower voltage level.

Safety Precautions

  • Exercise caution to prevent inadvertent cross-connections between AC and DC voltages.
  • Implement proper labeling and insulation measures to clearly differentiate between AC and DC circuits.
  • Adhere to recommended wiring practices and safety guidelines to maintain system reliability and prevent electrical hazards.


  • Prepare for Installation: Ensure the VME I/O processor rack is powered down to prevent electrical hazards during installation.
  • Board Insertion: Carefully slide the DIO board into the designated slot within the VME I/O rack.
  • Using your hands, push the top and bottom levers inward to securely seat the edge connectors of the board.
  • Secure the Board: Once the board is correctly positioned, tighten the captive screws located at the top and bottom of the front panel. This ensures the board remains securely fastened within the rack.
  • Power On and Verification: Restore power to the VME rack once the board is securely installed. Verify the status of the diagnostic lights located at the top of the front panel. These lights provide valuable information regarding the operational status of the board.


  • Operates by passing input voltages through optical isolators, ensuring electrical isolation for safety and reliability purposes. These input signals are sampled at specific frame rates to facilitate control functions effectively. Additionally, for sequence of events (SOE) reporting, the signals are sampled at a rate of 1 millisecond (ms) to capture events accurately and in real-time.
  • Once the signals are sampled, the board transfers them over the VME (Versa Module Eurocard) backplane to the VCMI. The VCMI acts as an intermediary, receiving the signals and forwarding them to the controller for further processing and decision-making.
  • This process ensures that input signals from various sources are efficiently handled, sampled at appropriate rates, and reliably transmitted to the controller via the VME backplane, enabling effective monitoring and control of voltage conditions within the system.

The WOC team is always available to help you with your Mark VI requirements. For more information, please contact WOC.

Frequently Asked Questions

What is IS200VCRCH1BBC?
It is a discrete input/output board developed by GE under the Mark VI series.

What do the LEDs on the I/O board front panel indicate?
The normal RUN condition is indicated by a flashing green LED, while FAIL is represented by a solid red LED. The third LED, labeled STATUS, remains off under normal conditions but turns steady orange if a diagnostic alarm condition exists on the board.

How does the diagnostic monitoring work on the I/O board?
The diagnostics on the I/O board monitor each output by sampling and digitizing various parameters such as voltage drops across current sense resistors, D/A outputs, and shutdown relay contacts. Standard diagnostic information includes high and low limit checks, as well as configurable high and low system limit checks. If any output becomes unhealthy, a composite diagnostic alarm occurs.

Can diagnostic signals be individually managed?
Yes, diagnostic signals can be individually latched and then reset with the RESET DIA signal if they return to a healthy state.

What information does the ID device on each cable connector provide?
Each cable connector on the terminal board has its own ID device, which contains information such as the terminal board serial number, board type, revision number, and the JR, JS, and JT connector location. If a mismatch is detected when the ID chip is read by the I/O processor, a hardware incompatibility fault is created.