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The IS200VCRCH1B is a Discrete Input/Output board manufactured by GE as part of the Mark VI series used in gas turbine control systems.

The Contact Input/Relay Output Board accepts 48 discrete inputs and manages 24 relay outputs from a total of four-terminal boards through its accompanying daughterboard.

The double-width VCCC module fits in the VME I/O rack. Two sets of J3/J4 connections are provided in this rack for cabling to the TBCI and TRLY terminal boards.

The input voltages in the VCCC are sampled at the frame rate for control functions and at 1 ms for SOE reporting after passing through optical isolators. The signals are delivered to the VCMI via the VME backplane.

Filters on each input control surge and decrease high-frequency noise close to the signal exit. A 4 ms filter is used to filter out noise and contact bounce. With 125 V dc excitation, the ac voltage rejection (50/60 Hz) is 60 V RMS.

For TMR applications, plugs JR1, JS1, and JT1 provide contact input voltages to the three VME board racks R, S, and T. Each controller rack's VCMI board votes on the outcomes once the three VCCCs have analyzed the signals. Relay control signals and monitor feedback voltages are transmitted between VCCC and TRLY through cables.