GE Fanuc Analog Input Module IC694ALG223

Product Overview

The GE IC694ALG223 is a 16-Channel Analog Current Input Module for the Emerson PACSystems RX3i programmable automation controller platform. It provides single-ended current inputs configurable for 4-20 mA, 0-20 mA, or 4-20 mA Enhanced ranges, with alarm limits and open-wire fault detection capabilities.

Key Specifications

• Model Number: IC694ALG223
• Series: PACSystems RX3i
• Product Type: Analog Current Input Module
• Channels: 16 single-ended inputs
• Input Ranges (Software Configurable):
  • 4 to 20 mA
  • 0 to 20 mA
  • 4 to 20 mA Enhanced (with open-wire fault detection)
• Input Filter Response: 200 Hz
• Maximum Input Circuit Current: 65 mA
• Power Consumption: 120 mA @ +5VDC (backplane); 65 mA @ +24VDC isolated (plus current loop current(s))
• Resolution: 12 binary bits (A/D converter)
• Absolute Accuracy: ±0.25% of full scale @ 25°C; ±0.5% @ 0-60°C
• Update Rate: 15 milliseconds (all 16 channels)
• Operating Temperature: 0°C to 60°C (32°F to 140°F)
• Storage Temperature: -40°C to 85°C
• Humidity: 5% to 95% (non-condensing)

LED Indicators

• MODULE OK LED:
  • ON: Status OK, module configured
  • OFF: No backplane power or watchdog timeout
  • Rapid flashing: Configuration data not received from CPU
  • Slow flashes then OFF: Failed power-up diagnostics or code execution error
• User Supply LED: Indicates external 24 VDC supply is within specifications

Core Features

• 16-channel high-density current input
• Three configurable input ranges including Enhanced for open-wire detection
• High and low alarm limits on all ranges
• 4-20 mA Enhanced range detects open-wire faults (4 mA to 0 mA)
• Module status and external power status reporting to CPU
• Built-in protection allows 32 mA fast blow fuse per channel

Applications

• 4-20 mA process transmitter monitoring
• Multi-point current loop data acquisition
• Open-wire fault detection in critical loops
• Process variable trending and logging

FAQ

Q: What is the difference between 4-20 mA and 4-20 mA Enhanced?
A: The 4-20 mA Enhanced range allows setting a low alarm limit down to 0 mA, providing open-wire fault detection. Standard 4-20 mA range cannot detect open-wire conditions.

Q: How much external 24V power is required?
A: The module requires 65 mA from the user-supplied +24 VDC isolated supply, plus the current loop current(s) from all active channels.

Installation Guide

1. Power down the RX3i rack before installation.
2. Insert the IC694ALG223 into any I/O slot of the RX3i universal backplane.
3. Connect 4-20 mA field signals to the input terminals.
4. Provide external +24 VDC isolated power supply.
5. Configure channels, ranges, and alarm limits via RX3i programming software.
6. Verify MODULE OK and User Supply LEDs indicate proper operation.

Selection Tips

• For voltage input, use IC694ALG222 (16-channel voltage input).
• For universal input (TC/RTD/Voltage/Current), use IC695ALG600.
• For 8-channel current input, use IC694ALG221.
• Install 32 mA fast blow fuses externally for channel protection.