IS200VAOCH1CBB - Analog Output Board

IS200VAOCH1CBB - Analog Output Board IS200VAOCH1CBB - Analog Output Board

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Part No.: IS200VAOCH1CBB
Manufacturer: General Electric
Country of Manufacture: United States of America (USA)
Number of channels: 16
Analog outputs: 0-20 mA
D/A converter resolution/accuracy: 12 bit resolution
Frame rate: 100 Hz
Product Type: Analog Output Board
Availability: In Stock
Series: Mark VI

Functional Description

IS200VAOCH1CBB is an analog output board developed by GE. It is a part of Mark VI control system.The Analog Output Board plays a critical role in precision control by overseeing 16 analog outputs, each operating at 20 mA. These outputs are meticulously wired to two terminal blocks on the Analog Output Terminal Board (TBAO). The TBAO, serving as the interface hub, establishes connections to the VME rack, where the VAOC processor board is strategically positioned. The communication between the VAOC and the controller occurs over the VME backplane, specifically facilitated by the VCMI (VME Control and Monitoring Interface).


  • In its operational cycle, the card receives digital values from the controller, processes these inputs, and converts them into analog output currents. These currents are then transmitted to the TBAO, where they are meticulously measured. The measured actual output current is subsequently fed back to the VAOC for continuous control, ensuring precise and responsive analog outputs.
  • In scenarios requiring Triple Modular Redundancy (TMR) applications, control signals are distributed into the same TBAO from three separate VME board racks labeled R, S, and T. This setup necessitates six cables to support all 16 outputs in a TMR configuration. Notably, each final current output is determined through a median select mechanism. This unique feature involves selecting the median value from the three currents provided by the three VAOCs, thereby enhancing redundancy and fault tolerance in critical control applications.
  • The VAOC's capability to handle analog outputs, its strategic connection to the VME rack via the TBAO, and its integration with TMR setups underscore its versatility and reliability in complex control systems. This architecture ensures not only precise analog signal generation but also robustness in scenarios where redundancy and fault tolerance are paramount, making it a valuable component in industrial control and automation setups.


  • Power Down the VME I/O Processor Rack: Prior to initiating the installation procedure, it is imperative to power down the entire VME I/O processor rack. This safety measure ensures a controlled environment for handling the hardware and prevents potential electrical hazards during the installation process.
  • Slide in the VAOC Board and Engage Levers: With the VME I/O processor rack powered down, carefully slide the board into the designated slot. Use your hands to push the top and bottom levers on the board. This action helps seat the edge connectors securely into the corresponding slots within the rack. Ensuring proper alignment is essential for establishing reliable connections.
  • Tighten Captive Screws on the Front Panel: Once the VAOC board is correctly inserted and the levers engaged, proceed to tighten the captive screws located at the top and bottom of the front panel. Captive screws are designed to stay attached to the board even when fully loosened, preventing accidental misplacement or loss during the installation process. Tightening these screws ensures the board is firmly secured in place.
  • Power Up the VME Rack: With the board securely installed and the captive screws tightened, power up the VME I/O processor rack. This step initiates the electrical connection and enables the VAOC board to become an integral part of the operational setup.
  • Check Diagnostic Lights: As the VME rack powers up, direct attention to the diagnostic lights located at the top of the board's front panel. These lights serve as valuable indicators of the board's status and can provide insights into its operational health. Ensure that the diagnostic lights align with the expected patterns or codes specified in the system documentation. Any deviations from the expected light patterns may indicate potential issues that need to be addressed.
  • Verification and Testing: To complete the installation process, perform a thorough verification and testing of the board. Confirm that it is recognized by the system, check for any error messages or anomalies, and ensure that the board is ready to perform its intended functions.


  • Analog Output Generation: It houses a Digital-to-Analog (D/A) converter coupled with a driver mechanism. This combination orchestrates the generation of controlled currents, translating digital input signals into analog output values with remarkable accuracy and stability.
  • Current Measurement Method: To ascertain the output current, a cleverly devised technique is employed. The voltage drop across a resistor integrated onto the terminal board is meticulously measured. This method ensures an indirect yet reliable means of quantifying the current flowing through the circuit.
  • D/A Converter: Ensures fidelity in output current generation, catering to the demands of diverse applications with consistency and reliability.
  • Driver Circuitry: Working hand in hand with the D/A converter, the driver circuitry plays a crucial role in amplifying and regulating the output currents. By meticulously controlling the flow of current, the driver circuitry ensures that the desired output levels are achieved with minimal deviation or distortion, thereby upholding the integrity of the control system.
  • Resistor Integration: The terminal board is outfitted with strategically placed resistors, serving as essential components for current measurement. These resistors, carefully selected and calibrated, facilitate accurate determination of the output current by monitoring the voltage drop across them, providing invaluable feedback for system monitoring and control.

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 IS200VAOCH1CBB?
It is an analog output board developed by GE under the Mark VI series.

How are the outputs of the board monitored?
Each output undergoes thorough monitoring through diagnostics. Voltage drops across various components, including local and outer loop current sense resistors, D/A outputs, and shutdown relay contacts, are consistently sampled and digitized to assess the health and performance of the outputs.

What diagnostic information is available for the outputs?
Standard diagnostic information is provided for the outputs, encompassing high and low limit checks, along with configurable high and low system limit checks. If any of the 16 outputs becomes unhealthy, a composite diagnostic alarm, L3DIAG VAOC, is triggered, signaling the occurrence of a potential issue. Detailed information about individual diagnostics can be accessed from the toolbox.

How can the diagnostic signals be managed?
The diagnostic signals can be individually latched, allowing for the freezing of specific diagnostic information for further analysis. Subsequently, if the issues are resolved, the RESET DIA signal can be utilized to reset the latched diagnostics, returning them to a healthy state.

Is there a unique identifier for each cable connector on the terminal board?
Yes, each cable connector on the terminal board is equipped with its own ID device. This read-only chip is coded with essential information, including the terminal board serial number, board type, revision number, and the JR, JS, and JT connector locations. The I/O processor interrogates this ID device for system compatibility.