IS200VAOCH1A - VAOC Analog Output Board | GE Mark VI | B7B

The General Electric IS200VAOCH1A (VAOC) is an Analog Output board for GE SPEEDTRONIC™ Mark VI turbine control systems. It controls 16 analog, 0-20 mA current outputs, with a D/A converter and driver on the board generating the controlled currents.

VAOC receives digital output values from the controller over the VME backplane through the VCMI board, converts them to analog currents, and drives them to an IS200TBAO or IS200DTAO analog output terminal board. Output current is measured on the terminal board and fed back to VAOC for closed-loop control. In triple modular redundant (TMR) systems, three VAOC boards on VME racks R, S, and T are cabled to a common terminal board, and each output is the median-selected value of the three board currents.

IS200VAOCH1A belongs to the original VAOC generation (all versions through VAOCH1B) and requires an IS200TBAOH1B terminal board or earlier, or any revision of IS200DTAI, supporting up to 500 Ω load resistance at the end of 1000 ft of #18 wire.

For maintenance and procurement teams, IS200VAOCH1A should be selected to match the existing GE Mark VI rack, terminal-board generation, and redundancy configuration (simplex or TMR) per GEH-6421 Volume II.

Control system parts are provided by GTC Control Solutions, Inc., a wholly owned subsidiary of B7B. Parts are offered in unused, repaired, or remanufactured condition, subject to availability. Each repaired or remanufactured component undergoes functional testing in energized panels, with test reporting and warranty support provided for repair and lifecycle-extension programs.