
About the IS200VAICH1DAA IS200VAICH1D
IS200VAICH1D is a Contact Input Group Isolation terminal board developed by GE. The VAIC (Analog Input/Output Control) board accepts 20 analog inputs and controls four analog outputs. Ten inputs and two outputs are available on each terminal board. The terminal board is connected to the VME rack, which houses the VAIC processing board, through cables. VAIC converts the inputs to digital values and sends them to the VCMI board, which then sends them to the controller through the VME backplane. The VAIC translates digital values to analog currents and drives them into the customer circuit via the terminal board. Both simplex and triple modular redundant (TMR) applications are supported by VAIC.
IS200VAICH1D Features

Number of channels:
24 channels per VAIC board (20 AI, 4 AO) (two-terminal boards)
Input span:
4-20 mA, ±1 mA, ±5 V dc, ±10 V dc
Input converter resolution:
16-bit A/D converter with 14-bit resolution
Power consumption:
Less than 31 MW
Compressor stall detection:
Within 30 milliseconds, detection and relay operation are completed.
IS200VAICH1D Diagnostics
- The state of the VAIC front panel is shown by three LEDs at the top. The RUN state is flashing green, whereas the FAIL condition is a solid red. The third LED shows STATUS and is ordinarily off, but flashes a constant orange if the board has a diagnostic alert condition. The following diagnostic tests are included:
- Hardware limit testing is performed on each analog input using non-customizable high and low levels that are predetermined to be near the limits of the operational range. A logic signal is set and the input is no longer examined if this limit is exceeded. The entire board generates a composite diagnostic warning called L3DIAG VAIC if any hardware limit on the input is reached. Information about each diagnosis is available from the toolbox. Individual diagnostic signals may be latched, and the RESET DIA signal may be used to reset them.
- System limit checking for each input is based on programmable high and low values. These restrictions, which can be adjusted for enable/disablement and latching/non-latching, can be utilized to trigger alarms. The out of bounds are reset via RESET SYS.
- In TMR systems, one signal is recognized and a defect is issued if it deviates from the median value-the value that was voted on-by more than a predefined amount. This may give an early warning that a problem is emerging in one channel.
- Take note of your D/A outputs, output currents, total current, suicide relays, and 20/200 mA scaling relays, as these are all susceptible to faults and are monitored for reasonability.
- VAIC examines the TBAI ID card. A read-only chip with the terminal board serial number, board type, revision number, and the location of the JR, JS, and JT connectors is where the board ID is encoded. A hardware incompatibility fault is triggered when the I/O processor reads the chip and encounters a mismatch.
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