What Is the IC694ALG223?
Struggling to integrate multiple analog current signals into your automation system reliably? The IC694ALG223 is a high-density analog current input module from GE Fanuc, part of the PACSystem RX3i series, now supported by Emerson Automation. This module provides sixteen single-ended input channels that accept 0-20 mA, 4-20 mA (normal), and 4-20 mA (enhanced) signals. With 12-bit digital resolution and a 13 ms channel update rate, it converts analog data from transmitters, transducers, and isolators into digital values for your controller.
Technical Specifications Breakdown
Key parameters from the datasheet define the IC694ALG223's performance:
- Input Channels: 16 single-ended inputs, configurable individually.
- Input Current Ranges: 0 to 20 milliamps and 4 to 20 milliamps (normal and enhanced).
- Digital Resolution: 12 bits, providing 4 µA/bit for 4-20 mA and 5 µA/bit for 0-20 mA and enhanced ranges.
- Channel Update Rate: 13 ms per channel, ensuring timely data capture.
- Accuracy: ±0.25% of full scale at 25°C (77°F); ±0.5% over the 0 to 60°C operating range.
- Input Impedance: 250 ohms.
- Input Low Pass Filter Response: 19 Hz.
- Power Requirements: 120 mA at 5 VDC from the backplane; 65 mA at 24 VDC from an external supply (20 to 30 VDC range).
- External Supply Range: 20 to 30 Volts DC.
These specs make the module suitable for precise current measurement in industrial environments.
Industry Applications
In process control, the IC694ALG223 interfaces with 4-20 mA transmitters for pressure, flow, or temperature monitoring. Its enhanced 4-20 mA range supports open-wire fault detection, critical for remote installations. For example, in a water treatment plant, the module reads signals from multiple flow meters, converting them to digital data for the RX3i controller. The 13 ms update rate ensures real-time response to process changes.
Installation & Setup Guidance
Install the IC694ALG223 in any single slot of a PACSystem RX3i chassis. Use configuration software to set each channel to 0-20 mA, 4-20 mA normal, or 4-20 mA enhanced. Wire the external 24 VDC supply (20-30 VDC range) to power the current loops. For 4-20 mA enhanced mode, enable open-wire detection alarms. Ensure the module's current draw of 120 mA at 5 VDC is within the backplane capacity.
Maintenance & Reliability
Routine inspection of connections and the external power supply ensures reliable operation. The module operates from 0 to 60°C, so verify ambient conditions stay within this range. Factory calibration (4 µA/count for 4-20 mA, 5 µA/count for other ranges) eliminates the need for field adjustment. Periodic verification of alarm settings via software maintains fault detection integrity.
Compatibility & Integration
The IC694ALG223 works as local or distributed I/O with PACSystems RX3i and RX7i controllers. It also fits Series 90-30 PLC systems with a serial connector. The module reports power supply status and module status to the CPU, enabling system-level diagnostics.
Selection Guide & Purchasing Advice
Before ordering, verify your system's backplane current capacity and external supply voltage (20-30 VDC). The IC694ALG223 is active in the product lifecycle. Contact SpareTechPLC for current availability and pricing. We stock this module and can advise on compatible accessories.
Frequently Asked Questions
- What input ranges does the IC694ALG223 support?
It supports 0-20 mA, 4-20 mA (normal), and 4-20 mA (enhanced) ranges, configurable per channel.
- How does open-wire fault detection work?
In 4-20 mA enhanced mode, the module detects currents from 4 down to 0 mA, triggering an alarm for broken wires.
- What is the update rate for each channel?
The channel update rate is 13 ms, as specified in the datasheet.
- Can I use this module with Series 90-30 PLCs?
Yes, it can be installed in I/O slots of Series 90-30 PLC systems that have a serial connector.
- What is the accuracy over temperature?
Accuracy is ±0.25% of full scale at 25°C and ±0.5% over the 0 to 60°C operating range.
