The GE Fanuc IC694ALG222, also cataloged as the IC694ALG222 Analog Input Module, operates as a dedicated hardware component for analog voltage signal processing within PACSystems RX3i platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | IC694ALG222 |
| Brand | GE Fanuc Emerson |
| Origin | USA |
| Weight | 0.69 lbs (0.31 kg) |
| Dimensions | Single-slot RX3i module width |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 112 mA at 5 VDC backplane and 41 mA at 24 VDC user supply |
| Input Channels | 16 single-ended or 8 differential channels |
| Input Ranges | 0 to 10 VDC (unipolar), -10 to +10 VDC (bipolar) |
| Digital Resolution | 12 bit (2.5 mV/count at 0-10 V; 5.0 mV/count at -10 to +10 V) |
| Update Rate | 6 ms for 16 single-ended channels; 3 ms for 8 differential channels |
| Input Impedance | 250 ohms |
| Absolute Accuracy | +/-0.25% at 25 deg C; +/-0.5% full scale over operating temp |
| Input Filter Response | 200 Hz |
| Galvanic Isolation | 250 VAC continuous; 1500 VAC for 1 minute (field to backplane) |
| Terminal Interface | 20-screw terminal block |
Backplane Bus Communication Velocity & I/O Density Scaling
The IC694ALG222 module enhances backplane bus communication velocity across PACSystems RX3i backplane racks by transferring digitized 12-bit voltage readings directly into the host CPU table within execution scan cycles as fast as 3 ms for differential configurations. Scalable I/O density scaling allows flexible wiring layouts for up to 16 single-ended or 8 differential voltage channels on a single 20-screw terminal block. Firmware flash compatibility ensures uniform register allocation and automatic scanning across unipolar and bipolar signal boundaries. Optical isolation of 1500 VAC protects internal backplane logic from external ground loops and transient voltage disturbances.
Frequently Asked Questions
Q: What backplane and user power supplies are required for the IC694ALG222?
A: The module draws 112 mA from the +5 VDC backplane supply bus and 41 mA from an isolated +24 VDC external user supply.
Q: How do the channel scan update rates vary between wiring configurations?
A: All 8 differential input channels complete a full update scan in 3 ms, whereas all 16 single-ended channels require 6 ms for a complete update cycle.
Q: What is the digital step resolution for the supported input voltage ranges?
A: The 12-bit resolution yields 2.5 mV per count (1 LSB) for the 0 to 10 VDC unipolar range and 5.0 mV per count (1 LSB) for the -10 to +10 VDC bipolar range.
Field Installation Guidelines
- Disconnect backplane system power and de-energize external 24 VDC loops before inserting or removing the module.
- Align the module housing with the baseplate slot and push firmly until the rear connector latches into the RX3i backplane bus.
- Fasten the top and bottom mounting screws to secure mechanical grounding and lock the module against chassis vibration.
- Connect signal leads to the 20-screw terminal block according to either single-ended (16 channels) or differential (8 channels) terminal configurations.
- Route low-voltage analog wiring in dedicated raceways separated from AC power lines, grounding cable shields at a single chassis ground point.
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