Not Sure Which VAIC Generation Your Panel Uses? Check the Terminal Board First

Before ordering an IS200VAICH1D, confirm what's actually installed in your cabinet. The easiest way is to look at the terminal board, not the VAIC card: if your panel has an STAI terminal board, or a TBAIH1C or later, it's already set up for the H1D generation. If it has an older TBAIH1B (or earlier) or a DTAI terminal board, the panel is running the earlier VAIC generation (through H1C), and an H1D card will be a compatibility mismatch rather than a working replacement. Reading the terminal board label takes a few minutes and avoids an RMA down the line.

Why GE Split VAIC Into Two Generations

The difference is output drive capability. The original generation (H1B/H1C) supports up to 500 Ω of load on a 20 mA output over 1,000 ft of #18 wire. This IS200VAICH1D belongs to the later generation, rated for roughly 800 Ω over the same wire run, with up to 18 V available at the terminal board screw terminals — useful headroom on long cable runs to valves or actuators out in the plant.

What the Card Does

Function-wise, both generations work the same way: this is a VME Analog Input/Output card in the Mark VI processor rack, handling 20 analog inputs and 4 analog outputs through an onboard multiplexer, A/D converter, and D/A converter. Field devices wire to the terminal board, which links to the VAIC by cable; the card digitizes inputs and sends them across the VME backplane to the VCMI communications card for delivery to the controller, and reverses the process to drive analog outputs.

Simplex or TMR

In a Triple Modular Redundant panel, one terminal board feeds three VAICs across the R, S, and T racks, and outputs are voted across all three cards so a single card failure doesn't interrupt the output. Simplex panels use one VAIC per terminal board with no voting. Know which architecture you have before ordering quantities.

Diagnose Before You Swap the Card

• Stuck, pegged, or noisy readings are frequently a terminal-board or field-wiring problem, not the VAIC itself — check fuses, loop power, and connections at the terminal board first.
• A hardware-incompatibility fault right after installing a replacement almost always means a terminal board/VAIC generation mismatch — recheck compatibility before assuming the new card is faulty.
• On TMR systems, a single flagged channel usually points at that field signal, not necessarily the card reporting it.
• Compressor stall trips are firmware-driven off the first four analog inputs — verify the pressure transducers before suspecting the card.

Part Number Breakdown

IS200VAICH1D IS200VAICH1DAA — the AA following H1D marks the specific revision; always confirm against the physical label since not every H1D board carries the same revision history. Our part number decoder explains what each segment of a Mark VI IS200 number represents.

Related Parts

STAI and TBAIH1C-or-later terminal boards, and the VCMI communications card, round out what you'll typically need alongside a VAIC order. The full Mark VI IS200 boards collection covers the rest of the panel.

Send Us This for a Quote

• Part number and suffix (IS200VAICH1DAA)
• Terminal board currently installed
• Turbine model and panel type (simplex/TMR)
• Urgency and quantity

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