IS200VAICH1CBC - Analog Input/Output (VAIC) Board

SPECIFICATIONS:

Part Number: IS200VAICH1CBC
Manufacturer: General Electric
Series: Mark VI
Number of Channels: 24
Input Span: 4-20 mA
Input Impedance: 4-20 mA
Input Converter Resolution: 16-bit A/D Converter
Product Type: Analog Input/Output (VAIC) Board
Scan Time: 10 ms
Output Converter: 12-bit
Temperature Operating: 0 to 60°C
Memory: 128 MB of flash memory
Ethernet: 10BaseT/100BaseTX (RJ-45)
Microprocessor: Intel Celeron 300 MHz
Size: 26.04 cm high x 1.99 cm wide
Repair: 3-7 Day
Availability: In Stock
Weight: 2 lbs
Country of Origin: United States
Manual: GEH-6421M

FUNCTIONAL DESCRIPTION:

IS200VAICH1CBC is an Analog Input/Output (VAIC) Board Manufactured and designed by General Electric as part of the Mark VI Series used in GE Speedtronic Gas Turbine Control Systems. The VAIC board handles 20 analog inputs and controls 4 analog outputs. Each terminal board supports 10 inputs and 2 outputs, with connections to the VAIC processor board in the VME rack via cables. The VAIC converts analog inputs to digital signals, which are then transmitted over the VME backplane to the VCMI board and subsequently to the controller. For outputs, it converts digital signals to analog currents, which are delivered through the terminal board into the customer circuit. The VAIC can be used in both simplex and triple modular redundant (TMR) configurations. In a TMR setup, input signals are distributed across three VME racks (R, S, T), each housing a VAIC. The output signals are managed by a proprietary circuit that ensures the correct current using all three VAICs. In case of a failure, the malfunctioning VAIC is isolated, and the remaining two boards continue functioning normally. In a simplex configuration, input signals are directed to a single VAIC, which generates all the output currents.

OPERATION:

The VAIC board supports 20 analog inputs and manages 4 analog outputs, incorporating signal conditioning, an analog MUX, an A/D converter, and a D/A converter. The inputs can be voltage, 4-20 mA, or from a terminal board. Of the 4 analog outputs, 2 are fixed at 4-20 mA, while the other 2 can be configured for either 4-20 mA or 0-200 mA. The inputs and outputs are equipped with noise suppression circuitry to shield against surges and high-frequency interference. In a TMR configuration, the analog inputs are distributed across the three control racks, JR1, JS1, and JT1. The 24 V DC power for the transducers is supplied by all three VME racks and is diode OR selected on the terminal board. Each analog current output is driven by currents from all three VAIC boards. The output current is determined by measuring the voltage across a series resistor, with the final output being the median (voted middle value) of the three current measurements.

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FREQUENTLY ASKED QUESTIONS:

What types of analog inputs does the VAIC board support?

The VAIC board supports three types of analog inputs: voltage, 4-20 mA, and terminal board inputs.

How are the analog outputs configured?

The VAIC board has four analog output circuits. Two of the outputs are fixed to 4-20 mA, and the other two can be configured for either 4-20 mA or 0-200 mA.

Does the VAIC board have noise protection?

Yes, both the inputs and outputs of the VAIC board are equipped with noise suppression circuitry to protect against surges and high-frequency noise.

What power supplies the VAIC's transducers in TMR configurations?

In TMR configurations, the 24 V DC power required for the transducers is supplied by all three VME racks (JR1, JS1, and JT1), with diode OR selection on the terminal board.