IS200VAOCH1CAB - Analog Output Board

IS200VAOCH1CAB - Analog Output Board IS200VAOCH1CAB - Analog Output Board

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Part No.: IS200VAOCH1CAB
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
Temperature rating: 0 to 60 oC
Product Type: Analog Output Board
Availability: In Stock
Series: Mark VI

Functional Description

IS200VAOCH1CAB is an analog output board developed by GE. It is a part of Mark VI control system. The Analog Output Board serves as a critical component in the control system, managing 16 analog outputs with a 20 mA capacity each. These outputs are intricately connected to the Analog Output Terminal Board via two dedicated terminal blocks. The seamless integration is facilitated by cables featuring molded plugs that establish a connection between the terminal board and the VME rack, strategically housing the processor board.


  • Operating within a larger system, it plays a pivotal role by receiving digital values from the controller through the VME backplane, specifically from the VCMI. Upon receiving these digital signals,it adeptly converts them into analog output currents, subsequently transmitting them to the TBAO for further distribution.
  • It is noteworthy that the actual output current is meticulously measured on the terminal board, creating a closed-loop system where this feedback is then processed to maintain precise control.
  • In scenarios demanding Triple Modular Redundancy (TMR) applications, the complexity of the system increases. Control signals from three VME board racks, namely R, S, and T, are consolidated onto the same terminal board. This intricate arrangement requires six cables, each playing a vital role in supporting all 16 outputs with TMR functionality. Notably, the final current output for each channel is determined through a median select process.
  • The three currents originating from the three VAOCs are subjected to this median select circuit, which resides within each VAOC. Consequently, the output current that is forwarded to the larger system is the median value of the three, ensuring a robust and reliable performance, especially in TMR applications where redundancy and fault tolerance are paramount. This innovative design enhances the overall reliability and stability of the analog output system, making it well-suited for demanding applications.


  • Power Down the VME I/O Processor Rack: Begin the installation process by powering down the VME I/O processor rack. This is a crucial step to ensure the safety of both the equipment and personnel during the installation.
  • Slide in the VAOC Board: With the VME I/O processor rack powered down, carefully slide in the board into the designated slot. Take note of the correct orientation to align the edge connectors properly. Once the board is positioned correctly, use your hands to push the top and bottom levers, securing the board in place.
  • Secure Edge Connectors: Ensure a stable connection by securing the edge connectors. This is achieved by pushing the top and bottom levers firmly, guaranteeing that the edge connectors are properly seated. This step is critical to establish reliable communication and functionality between the board and the overall system.
  • Tighten Captive Screws: To further enhance the stability of the VAOC within the VME rack, tighten the captive screws located at the top and bottom of the front panel. This step is essential in preventing any unintentional movement or dislodgment of the board during operation.
  • Power Up the VME Rack: Once the board is securely in place and all connections are confirmed, proceed to power up the VME rack. This step should be executed cautiously, ensuring that the power-up sequence adheres to the recommended procedures for the specific system. Be vigilant for any abnormal behavior during this process.
  • Check Diagnostic Lights: After powering up the VME rack, carefully inspect the diagnostic lights located at the top of the VAOC board's front panel. These lights serve as indicators of the board's operational status. Confirm that the diagnostic lights align with the expected behavior, as outlined in the system documentation. Any discrepancies or anomalies should be addressed promptly.


  • The latest iteration, VAOCH1C, and any subsequent releases are designed with enhanced capabilities, particularly in supporting higher load resistance on the first eight output circuits. When driving 20 mA outputs, these boards provide a drive voltage of up to 18 V at the terminal board screw terminals. This expanded capability enables the operation into loads of 800 W with 300 m (984 ft) of 18 wire, providing a substantial margin for diverse applications.
  • Notably, the second set of eight output circuits in the VAOCH1C retains the original 500 W rating of the first generation. To ensure compatibility and optimal functionality, VAOCH1C requires the use of terminal board TBAOH1C or any later versions. This upgraded terminal board is specifically designed to accommodate the enhanced features of the latest board, creating a seamless integration that maximizes the performance potential of the entire 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 IS200VAOCH1CAB?
It is an analog output board developed by GE under the Mark VI series.

What diagnostics are monitored for each output?
The diagnostics for each output include voltage drops across local and outer loop current sense resistors, D/A outputs, and shutdown relay contacts. These values are sampled and digitized to ensure comprehensive monitoring.

What standard diagnostic information is available for the outputs?
Standard diagnostic information for the outputs includes checks for high and low limits, as well as high and low system limit checks, which are configurable based on system requirements.

What happens if one of the 16 outputs becomes unhealthy?
In the event that any of the 16 outputs goes unhealthy, a composite diagnostic alarm, labeled L3DIAG VAOC, is triggered. This alarm serves as an indication that there is an issue with one or more outputs. Further details about individual diagnostics can be accessed from the toolbox.

Can the diagnostic signals be individually latched and reset?
Yes, the diagnostic signals can be individually latched, and if they return to a healthy state, they can be reset using the RESET DIA signal. This feature allows for a more granular approach to managing and addressing diagnostic issues.

What information is stored in the ID device of each cable connector on the terminal board?
Each cable connector on the terminal board is equipped with an ID device. This read-only chip contains information such as the terminal board serial number, board type, revision number, and the JR, JS, and JT connector location.