Description
IC694ALG223 Product Overview
The IC694ALG223 is a 16-channel, 12-bit analog current-input module that snaps into any I/O slot of an Emerson PACSystems RX3i rack. It is purpose-built to bring standard 4–20 mA or 0–20 mA process signals—pressure, flow, temperature, valve position, motor load—into the PLC without external shunts or signal conditioners.
The IC694ALG223 is a 16-channel, 12-bit analog current-input module that snaps into any I/O slot of an Emerson PACSystems RX3i rack. It is purpose-built to bring standard 4–20 mA or 0–20 mA process signals—pressure, flow, temperature, valve position, motor load—into the PLC without external shunts or signal conditioners.
Inside the control hierarchy the card sits at the “sensor interface” layer: it presents a precision 250 Ω burden to each loop, digitises the resulting 1–5 V drop to 12-bit resolution, and makes the raw or scaled value available to the RX3i CPU every 13 ms. Differential (single-ended) inputs and 250 V optical isolation reject ground-shift noise common in motor-drive or power-plant environments, while the 4 µA per-count resolution keeps flow or temperature loops stable.
Being part of the RX3i family means the module is hot-swappable, rack-powered, and auto-recognised by the CPU—no DIP-switch banks and no external 24 V supply needed when located in a universal backplane.
IC694ALG223
Technical Specifications
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Model Number: IC694ALG223
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Manufacturer: GE / Emerson
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Product Type: Analog Current Input Module
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Channels: 16 single-ended, isolated
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Input Ranges: 4–20 mA (default), 0–20 mA, or 4–20 mA Enhanced (jumper-selectable per pair)
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Resolution: 12-bit (4 µA per count @ 4–20 mA; 5 µA per count @ 0–20 mA)
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Update Rate: 13 ms (all sixteen channels)
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Input Impedance: 250 Ω ±0.1 %
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Isolation: 250 V working, optical
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Accuracy: ±0.1 % full scale + 0.1 % reading
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Power Consumption: 120 mA @ +5 VDC (backplane); 65 mA plus loop current(s) from user-supplied +24 VDC
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Filter Response: 200 Hz (–3 dB)
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Hot Swap: Supported in RX3i universal backplane
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Temperature: –40 … +70 °C operational; –40 … +85 °C storage
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Agency Approvals: UL, CE, ATEX Zone 2, ABS, BV, DNV-GL, KRS, LR
Core Features & Customer Value
250 Ω burden resistor on-board – Eliminates external shunts and wiring errors; the resistor is factory-trimmed to ±0.1 %, so loop accuracy is maintained without user calibration.
250 Ω burden resistor on-board – Eliminates external shunts and wiring errors; the resistor is factory-trimmed to ±0.1 %, so loop accuracy is maintained without user calibration.
16-channel density – One card replaces four 4-channel modules, freeing rack slots and reducing spare-parts inventory.
4–20 mA Enhanced range – Optional range detects 0–4 mA (open-wire) and triggers a low-alarm bit, giving you early warning of broken sensor leads without extra hardware
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IC694ALG223
13 ms update for all channels – Fast enough for anti-surge, flow-control, or motor-current loops; you get deterministic data every scan without adding CPU overhead.
Hot-swap & auto-configure – Module can be inserted or removed while the RX3i rack is powered, and the CPU automatically recognises range settings—no DIP switches to set.
Typical Applications
In combined-cycle plants the IC694ALG223 is routinely installed in the “analog input” section of RX3i racks that govern gas-turbine fuel flow, inlet-guide-vane position, and cooling-water temperature. The 13 ms update keeps the speed-control loop responsive, while the 4–20 mA range matches the plant’s standard temperature and pressure transmitters.
In combined-cycle plants the IC694ALG223 is routinely installed in the “analog input” section of RX3i racks that govern gas-turbine fuel flow, inlet-guide-vane position, and cooling-water temperature. The 13 ms update keeps the speed-control loop responsive, while the 4–20 mA range matches the plant’s standard temperature and pressure transmitters.
In pipeline compressor stations the same module reads 4–20 mA signals from suction/discharge pressure transmitters and anti-surge valve positioners, feeding real-time data to the anti-surge PID running in the RX3i CPU.
Because the card is certified for Zone 2 and marine environments, it is also used on off-shore platforms for well-head pressure and subsea valve-position feedback without needing additional isolation barriers.
