IC694ALG223: Analog Current Input on PACSystem RX3i
The IC694ALG223 is an analog current input module for the PACSystem RX3i platform, and current input is the default choice for process measurement because a 4-20 mA loop is the most robust signal type in industrial instrumentation — it is unaffected by lead resistance and tolerates long cable runs without the error that a voltage signal accumulates.
Where voltage input is used, the error from cable resistance and lead length has to be budgeted. On a current loop that error does not exist, which is why process instrumentation defaults to current and voltage inputs are used where the physical quantity is genuinely a voltage.
The IC694ALG223 is a 16-channel analog current input module from GE Fanuc for PACSystem RX3i. It accepts 0-20 mA and 4-20 mA signals with 12-bit resolution and 13 ms update rate. Features open-wire detection on enhanced 4-20 mA range. Requires 120 mA at 5 VDC from backplane and 65 mA at 24 VDC from external supply (20-30 VDC).
| Feature | Specification |
|---|---|
| Manufacturer | GE Fanuc / GE Intelligent Platforms |
| Brand | GE |
| Part Number | IC694ALG223 |
| Brand | GE Fanuc Series: PACSystem RX3i Manufacturer: Emerson Automation Part Number: IC694ALG223 Product Type: Analog current input module Number of Channels: 16 single-ended inputs Input Current Ranges: 0 to 20 milliamps, 4 to 20 milliamps Channel Update Rate: 13 ms Power Requirements: 120 milliamps at 5 Volts DC Digital Resolution: 12 bit Input Impedance: 250 ohms Analog Resolution: 4–20 mA: 4 µA/bit |
| 0–20 mA | 5 µA/bit |
| 4–20 mA Enhanced | 5 µA/bit External Supply Range: 20 to 30 Volts DC Accuracy: ±0.25% of full scale @ 25°C |
| ±0.5% over operating temperature range Input Low Pass Filter Response | 19 Hz Current Draw: 120 mA @ 5 VDC |
| 65 mA @ 24 VDC (user supplied) Operating Temperature | 0 to 60 degrees Celsius Calibration: 4 µA per count on 4 to 20 mA range |
RX3i Analog Input Modules
RX3i analog input modules differ in signal type (current or voltage), channel count and isolation topology. Confirming all three against the field loops is what prevents a module that fits the rack but not the wiring:
| IC694ALG Part Number | Analog Input Function |
|---|---|
| IC694ALG392 | PACSystem RX3i analog input module — confirm signal type and isolation against the loops |
| IC695ALG106 | PACSystem RX3i analog input module — confirm signal type and isolation against the loops |
| IC695ALG112 | PACSystem RX3i analog input module — confirm signal type and isolation against the loops |
| IC695ALG306 | PACSystem RX3i analog input module — confirm signal type and isolation against the loops |
| IC695ALG312 | PACSystem RX3i analog input module — confirm signal type and isolation against the loops |
| IC695ALG412 | PACSystem RX3i analog input module — confirm signal type and isolation against the loops |
| IC695ALG508 | PACSystem RX3i analog input module — confirm signal type and isolation against the loops |
| IC695ALG600 | PACSystem RX3i analog input module — confirm signal type and isolation against the loops |
All GE parts · I/O Modules · IC694ALG392 analog output
Input Protection and Loop Power
An analog input module can be damaged by a wiring error or a field device failure — a disconnected loop, a reversed connection or an over-range input are all common causes of module replacement. Confirm the module input protection rating before fitting, and verify the loop wiring against the module terminals before the first scan.
Channel Calibration and Drift
Verify each channel end to end after replacement: inject a known current at a low and a high point, confirm the reported value tracks, and leave the measurement at a mid-scale value for long enough to observe drift against a stable reference. Drift on a newly fitted module is easier to attribute than drift found later.
Isolation and Ground Potential
On process installations with multiple loops at different ground potentials, the isolation arrangement of the input module determines whether a ground loop distorts the readings. Confirm the isolation topology before fitting, because group-isolated and individually isolated modules behave differently on the same set of field conditions.
Supply & terms: Stock status: In Stock · Condition: New · Warranty: One Year · Origin: US. Listed by AutoDCS Tech Parts Team · Last updated .
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