Description
DS200FSAAG2A Product Overview
The DS200FSAAG2A is a 16-channel RST analog I/O terminal board used inside GE Mark V Speedtronic turbine and compressor control cubicles. It occupies a double-slot VME position and acts as the field-signal interface between the triple-redundant CPU and analog sensors such as pressure transmitters, RTDs, thermocouples, and servo-valve LVDTs.
The DS200FSAAG2A is a 16-channel RST analog I/O terminal board used inside GE Mark V Speedtronic turbine and compressor control cubicles. It occupies a double-slot VME position and acts as the field-signal interface between the triple-redundant CPU and analog sensors such as pressure transmitters, RTDs, thermocouples, and servo-valve LVDTs.
In the control hierarchy the board sits at the “sensor-interface” layer:
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It burdens 4-20 mA loops through precision 250 Ω resistors,
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excites 3-/4-wire RTDs with a 1 mA constant-current source,
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cold-junction-compensates thermocouples,
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and streams 12-bit data at 100 Hz per channel to the CPU over the VME backplane.
An on-board 12-bit ADC and digital filter ensure <0.1 % accuracy, while TVS diodes and 50/60 Hz notch filters give IEEE C37.90.1 surge immunity—essential for turbine temperature, pressure, and position loops.
The card is normally paired with the IS215FSAAG2A daughter board (which holds the ADCs and DSP) while DS200FSAAG2A provides the termination, excitation, and surge protection. Because both cards are certified for Zone 2 hazardous locations and operate from 24 VDC without fans, they are accepted in gas-turbine, steam-turbine, and compressor-control skids worldwide.
GE DS200FSAAG2A
Technical Specifications
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Model Number: DS200FSAAG2A
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Manufacturer: General Electric
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Product Type: RST Analog I/O Terminal Board
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Channels: 16 differential, isolated analog inputs
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Input Ranges: ±10 V, 0–20 mA / 4–20 mA, RTD (3-/4-wire), Thermocouple (J, K, T, E, etc.)
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Resolution: 12-bit A/D conversion
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Sampling Rate: 100 Hz per channel
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Cold-Junction Accuracy: ±0.5 °C (thermocouple mode)
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RTD Excitation: 1 mA constant-current source
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Surge Protection: TVS diodes, IEEE C37.90.1 compliant
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Noise Filtering: 50/60 Hz notch filters
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Isolation: 1500 V channel-to-ground
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Power Supply: 24 VDC logic (derived from backplane)
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Temperature: –40 … +85 °C storage; 0–60 °C operational
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Weight: ≈ 1.56 kg (3.4 lb)
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Certifications: CE, UL, RoHS, Zone-2 ready
GE DS200FSAAG2A
Core Features & Customer Value
Multi-range 16-channel density – One board replaces separate voltage, current, RTD, and TC cards, freeing Mark V slots and reducing spare-part count.
Multi-range 16-channel density – One board replaces separate voltage, current, RTD, and TC cards, freeing Mark V slots and reducing spare-part count.
12-bit, 100 Hz per channel – Delivers millisecond-level temperature or pressure updates for turbine protection loops without loading the main CPU.
Cold-junction & RTD on-board – On-chip CJC and 1 mA excitation eliminate external transmitters, saving panel space and wiring errors.
IEEE C37.90.1 surge immunity – TVS diodes and notch filters survive breaker-slam events common in power-plant switchyards.
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 DS200FSAAG2A is installed in Mark V racks that monitor gas-turbine exhaust temperature (type-K thermocouples), bearing-metal temperature (3-wire RTDs), and fuel-pressure transmitters (4-20 mA). The 100 Hz update keeps overtemperature protection responsive while the 12-bit resolution resolves 0.1 °C changes.
In combined-cycle power plants the DS200FSAAG2A is installed in Mark V racks that monitor gas-turbine exhaust temperature (type-K thermocouples), bearing-metal temperature (3-wire RTDs), and fuel-pressure transmitters (4-20 mA). The 100 Hz update keeps overtemperature protection responsive while the 12-bit resolution resolves 0.1 °C changes.
In pipeline compressor stations the same board reads 4-20 mA from suction/discharge pressure transmitters and drives anti-surge valve position feedback, using the ±10 V range when magnetic amplifiers require a voltage reference.
Because the board is certified for marine environments, it is also used on off-shore platforms for well-head temperature and subsea pressure feedback without needing additional isolation barriers.
