The Analog Input Board (VAIC) accepts 20 analog inputs and controls four analog outputs. Ten inputs and two outputs are wired to each Analog Input Terminal board (TBAI). Inputs and outputs have noise suppression circuitry to protect against surge and high frequency noise. Cables connect the terminal board to the VME rack where the VAIC processor board is located.
The VAIC converts the inputs to digital values and transfers these over the VME backplane to the VCMI, and then to the controller. Input signals are fanned out to three VME board racks R, S, and T for TMR applications. The VAIC requires two terminal boards to monitor 20 inputs.