The GE Fanuc IC694ALG221, also cataloged as the IC694ALG221 Analog Input Module, operates as a dedicated hardware component for analog current signal acquisition within PACSystem RX3i platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | IC694ALG221 |
| Brand | GE Fanuc / Emerson |
| Origin | USA |
| Weight | 0.40 kg (0.88 lbs) |
| Dimensions | Standard RX3i single-slot module |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 25 mA at 5 VDC (backplane), 100 mA at 24 VDC (isolated) |
| Number of Channels | Four (4) analog current input channels |
| Analog Signal Ranges | 0 to 20 mA, 4 to 20 mA |
| Resolution | 12 bit (5 uA/bit at 0-20 mA, 4 uA/bit at 4-20 mA) |
| Channel Update Rate | 2 ms across all four channels |
| Input Impedance | 250 ohms |
| Accuracy | 0.1% full scale (Absolute: 0.1% full scale + 0.1% reading) |
| Input Filter Response | 325 Hz |
| Common Mode Voltage | 200 V |
| Hot-Swapping Capability | Not Supported |
| Connector Type | 20-screw terminal block |
| Status Indicator | 1 Green "Module OK" LED |
Backplane Bus Communication Velocity & I/O Density Scaling
The IC694ALG221 interfaced directly to the PACSystem RX3i universal backplane transfers digitized loop data into CPU memory registers across each 2 ms scan interval. Designed to support four high-density current loops, the unit uses internal 12-bit analog-to-digital converters to translate 0-20 mA and 4-20 mA field signals with 250-ohm input termination. Onboard firmware flash compatibility ensures synchronized parameter configuration and factory-calibrated scaling offsets across all RX3i backplane rack slots without drift over operating temperature gradients.
Frequently Asked Questions
Q: Does the IC694ALG221 analog input module support hot-swapping during backplane operation?
A: No, hot-swapping is not supported. Power to the baseplate rack and field terminal connections must be isolated before insertion or removal of the module.
Q: What are the backplane internal power consumption requirements for this module?
A: The module draws 25 mA from the +5 VDC backplane logic supply and 100 mA from the isolated +24 VDC external power bus.
Q: What is the input conversion rate and response time for processing all analog channels?
A: The module features a 2 ms update time to evaluate and update digital values for all four input channels concurrently.
Field Installation Guidelines
- Disconnect backplane main power and field circuit wiring before seating the module into the baseplate slot.
- Align the module card edges with the RX3i backplane guide rails and press firmly until top and bottom latches secure the chassis.
- Wire 0-20 mA or 4-20 mA process loops to the removable 20-screw terminal block using shielded twisted-pair cabling.
- Connect the signal cable drain shield strictly to a single panel chassis ground point to prevent ground loop currents across the 200 V common mode voltage barrier.
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