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GE Fanuc IC694ALG221 PACSystems RX3i Analog Input Module
Description
Configured for analog current measurement conversion in PACSystems RX3i backplane architectures, the GE Fanuc IC694ALG221 (IC694ALG221 Analog Current Input Module) provides direct physical/electrical execution. The hardware processes four independent current loop channels covering 0-20 mA and 4-20 mA operational ranges. Internal analog-to-digital conversion routes digitized current telemetry directly to the host CPU via backplane bus interfaces, maintaining an input filter response cutoff of 325 Hz across a 250 Ohm input impedance load.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | IC694ALG221 |
| Brand | GE Fanuc |
| Origin | USA |
| Weight | 0.36 kg |
| Dimensions | 3.5 x 13.2 x 13.5 cm |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 100 mA at 24 VDC (isolated supply), 25 mA at 5 VDC (backplane bus) |
| Module Type | Analog Current Input Module |
| Input Channels | 4 channels |
| Input Signal Ranges | 0-20 mA, 4-20 mA |
| Resolution | 4 uA (4-20 mA range), 5 uA (0-20 mA range) |
| Accuracy | +/-0.1% full scale plus +/-0.1% of reading |
| Channel Update Rate | 2 ms per channel |
| Input Impedance | 250 Ohm |
| Input Filter Response | 325 Hz |
| Linearity | Less than 1 LSB |
| Common Mode Voltage | 200 V maximum |
| Status Indicator | Module OK LED (Green) |
Industrial Control Backplane Integration
The module interfaces via the PACSystems RX3i backplane bus, utilizing deterministic backplane communication velocity to transfer 12-bit converted values directly to the controller I/O map. The physical backplane link maintains firmware flash compatibility with all RX3i CPU models, drawing 25 mA from the logic bus rail and 100 mA from the isolated 24 VDC auxiliary field bus. Dedicated channel-to-channel signal path routing limits backplane bus noise insertion while executing parallel analog updates every 2 ms per active channel.
Frequently Asked Questions
Q: What are the backplane power supply requirements for the IC694ALG221?
A: The module requires 25 mA from the 5 VDC backplane bus rail for internal logic operations and 100 mA from an external or backplane-routed 24 VDC isolated supply to power current loop sensing electronics.
Q: Is hot-swapping supported for this module within the RX3i chassis?
A: Yes, the module supports hot-insertion and removal under power. However, field wiring terminal blocks should be disconnected or de-energized prior to extraction to prevent transient arcs or field device interruption.
Q: What input impedance is presented to field transmitters on each channel?
A: Each input channel presents a termination load of 250 Ohm to incoming 0-20 mA or 4-20 mA current loops.
Field Installation Guidelines
- Ensure the PACSystems RX3i rack power supply is properly grounded to the enclosure backplate using a low-impedance copper strap before module insertion.
- Align the module with the target slot keying guides and press firmly until the top and bottom retaining levers click into place on the backplane rail.
- Route current loop wiring using twisted, shielded pair cables. Ground the cable shield at one end only (typically at the PLC chassis ground bus) to eliminate ground loop current interference.
- Maintain a minimum separation of 150 mm between 24 VDC/4-20 mA signal wiring and high-voltage AC power lines or variable frequency drive cables.
- Ensure field transmitter loop power supply voltages do not exceed the maximum common mode voltage rating of 200 V relative to chassis ground.
Additional information
| Weight | 0.36 kg |
|---|---|
| Country of Origin | USA |
| Dimension | 3.5 x 13.2 x 13.5 cm |
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