Description
IS200VAICH1D Product Overview
The IS200VAICH1D is a double-slot VME analog-input “processor board” used inside GE Mark VI and Mark VIe Speedtronic turbine-control cubicles. It houses 16 fully isolated analog channels that accept ±5 V, 0-20 mA, or 4-20 mA field signals and convert them to 16-bit digital codes at up to 10 kHz per channel.
The IS200VAICH1D is a double-slot VME analog-input “processor board” used inside GE Mark VI and Mark VIe Speedtronic turbine-control cubicles. It houses 16 fully isolated analog channels that accept ±5 V, 0-20 mA, or 4-20 mA field signals and convert them to 16-bit digital codes at up to 10 kHz per channel.
In the control hierarchy the board sits at the “high-speed sensor interface” layer: it burdens current loops through precision resistors, applies programmable gain and digital filtering, and streams the data to the triple-redundant controller over the VME backplane. An on-board 32-bit floating-point DSP performs RTD/thermocouple linearisation, square-root extraction, and limit checking so the main CPU is off-loaded from scalar math.
The card is part of the VAIC (VME Analog Input Control) family—boards that share the same double-width VME form factor and 37-pin backplane connectors but vary in channel count and filtering options. One IS200VAICH1D is typically paired with one, two, or three TBAI terminal boards (depending on simplex or TMR architecture) to land field wires, provide surge suppression, and offer optional 250 Ω burdens for 4-20 mA loops.
Because the module is certified for Zone 2 hazardous locations and operates without a fan, it is widely used in gas-turbine, steam-turbine, and compressor-control skids where high-speed, high-accuracy temperature or pressure loops are mandatory.
IS200VAICH1D
Technical Specifications
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Model Number: IS200VAICH1D
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Manufacturer: General Electric
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Product Type: VME Analog Input Processor Board (VAIC)
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Channels: 16 differential, isolated analog inputs
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Input Ranges: ±5 V, 0–20 mA, 4–20 mA (jumper-selectable per channel)
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Resolution: 16-bit A/D conversion
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Sampling Rate: 10 kHz per channel (typical)
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Isolation: 1500 V channel-to-channel & channel-to-ground
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Signal Conditioning: Programmable gain, digital filtering, RTD/TC linearisation library
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DSP: 32-bit floating-point on-board for scalar math & diagnostics
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Backplane: VME64x, double-slot, 37-pin DIN connectors
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Power Supply: +5 V @ 1.5 A typical, ±15 V for analog front-end
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Indicators: 3 LEDs (Run, Fail, Status)
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Operating Temperature: 0 … +60 °C; –40 … +85 °C storage
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Weight: ≈ 0.48 kg
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Certifications: CE, UL, RoHS, Zone 2 ready
IS200VAICH1D
Core Features & Customer Value
16-bit, 10 kHz per channel – Delivers micro-second interrupt response and millisecond-level closed-loop control for turbine temperature or pressure PIDs without loading the main CPU.
16-bit, 10 kHz per channel – Delivers micro-second interrupt response and millisecond-level closed-loop control for turbine temperature or pressure PIDs without loading the main CPU.
1500 V isolation – Channel-to-channel and channel-to-ground isolation prevents ground-shift damage when 24 V battery and ±15 V analog supplies share a common reference.
RTD/TC library on-board – DSP performs RTD, thermocouple, and square-root linearisation, eliminating external signal conditioners and reducing wiring errors.
Works with 1-3 TBAI boards – One IS200VAICH1D can drive up to three TBAI terminal boards, supporting simplex, dual, or TMR redundant I/O architectures without hardware changes.
Zone-2 / marine certified – Certified for Class I Div. 2 and offshore environments, allowing direct installation in hazardous-location turbine skids without additional purge systems.
Typical Applications
In combined-cycle power plants the IS200VAICH1A is installed in Mark VIe racks that govern gas-turbine exhaust temperature, bearing vibration, and fuel-flow pressure. The 10 kHz sampling keeps the speed-control loop stable, while the RTD library linearises exhaust-thermocouple banks for overtemperature protection.
In combined-cycle power plants the IS200VAICH1A is installed in Mark VIe racks that govern gas-turbine exhaust temperature, bearing vibration, and fuel-flow pressure. The 10 kHz sampling keeps the speed-control loop stable, while the RTD library linearises exhaust-thermocouple banks for overtemperature protection.
In pipeline compressor stations the same module reads 4–20 mA from suction/discharge pressure transmitters and drives anti-surge valve positioners, using the bipolar ±5 V range when magnetic amplifiers require a zero-centred reference.
Because the board is certified for marine environments, it is also used on off-shore platforms for well-head choke-position and subsea temperature feedback without needing additional isolation barriers.
