GE IS200VAICH1DAB VAIC Analog I/O Control Board

The IS200VAICH1DAB (VAIC) is a VME bus analog I/O control board exclusively for GE Speedtronic Mark VI/Mark VIe turbine control systems. It serves as the core signal interface between field analog transmitters and rack main controllers, integrating multi-channel analog signal acquisition and analog output drive functions to monitor and regulate critical parameters of gas/steam turbines and generator units.

This single-slot pluggable board matches TBAIH1C/STAI terminal baseplates, with fully conformal coated PCB to adapt to high-temperature, dusty turbine workshop environments. It supports hot-swap replacement without rack shutdown, built-in full-channel self-diagnosis and fault feedback, and stably operates long-term under continuous power generation working conditions.

Main Specifications

• Brand: GE General Electric; Model: IS200VAICH1DAB; Series: Speedtronic Mark VI / Mark VIe Turbine DCS
• I/O Channel: 20 analog input channels + 4 analog output channels, grouped to match paired terminal boards
• Supported Signals: 4–20mA transmitters, RTD Pt100, thermocouples, proximity probe vibration signals
• Conversion Performance: 16-bit high-precision ADC, 10ms standard scan cycle at 100Hz sampling frequency
• Isolation Rating: Independent channel-to-backplane isolation, anti-surge circuit to suppress electromagnetic interference
• Backplane Power: 24VDC rack supply, low power consumption below 31W, standard VME single-slot installation
• Matching Accessories: TBAIH1C, STAI analog signal terminal baseplates and dedicated signal cables
• Environment: Operating -30℃ ~ +65℃, 5%–95% RH non-condensing, vibration-resistant industrial design
• Diagnostics: Front panel LED indicators for power, communication, open/short circuit and over-range faults
• Certifications: CE, UL industrial control compliance, meets power generation turbine safety standards

Core Functions

• Collect real-time analog signals of turbine fuel pressure, lube oil temperature, exhaust vibration and flow from field sensors for closed-loop control calculation.
• Convert digital control commands from the main controller into stable analog current output to adjust fuel valves, actuators and auxiliary regulating equipment.
• Onboard FPGA signal conditioning filters high-frequency noise from rotating machinery, ensuring consistent measurement accuracy under heavy industrial electromagnetic interference.
• Real-time channel self-diagnosis automatically detect broken wires, short circuits and signal out-of-limit faults, uploading alarm information to the turbine control host instantly.
• VME bus high-speed bidirectional data transmission realizes synchronous interaction with VCMI communication board and main CPU to guarantee millisecond-level control response.
• Hot-swappable modular structure allows single-board replacement without cutting off the whole turbine control rack, reducing unit unplanned maintenance downtime.

Application Scenarios

• Analog I/O spare replacement for GE Mark VI/VIe gas turbine and steam turbine control racks in thermal power plants and combined cycle power stations.
• Turbine monitoring spare parts for petrochemical refinery large centrifugal compressors, offshore platform power generation units and pipeline drive turbines.
• Maintenance backup inventory for industrial waste heat power stations, metallurgical furnace power generation auxiliary machines and generator excitation control systems.
• Matching analog signal board paired with Mark VI main controllers, TBAIH1C terminal bases and 4-20mA industrial transmitters.
• Retrofit replacement components for aging turbine control systems suffering signal drift, channel acquisition failure and analog output offset faults.

• Global aftermarket spare stock for power generation maintenance teams managing legacy GE Speedtronic turbine control equipment worldwide.