GE Fanuc PACSystems RX3i IC694ALG221 Analog Current Input Module

Product Overview

The GE Fanuc IC694ALG221 is a high-precision 4-channel analog current input module for the PACSystems RX3i automation platform. This module converts field instrument current signals into digital data for real-time monitoring and process control.

Technical Specifications

Key Technical Characteristics

The IC694ALG221 module interfaces directly with standard industrial process transmitters, signal converters, and loop isolators. Each of the four channels accepts either 4-20 mA or 0-20 mA current configurations. An onboard analog-to-digital converter processes incoming signals with remarkable accuracy. Specifically, the card achieves a baseline accuracy of ±0.1% full scale plus ±0.1% of the actual reading.

The hardware maintains superior signal stability through an input filter response of 325 Hz. Meanwhile, the internal circuitry exhibits a high linearity tolerance under 1 Least Significant Bit. For robust electrical safety, the architecture supports a high common-mode voltage limit up to 200 Volts. Factory calibration ensures immediate deployment accuracy across all current loops.

Diagnostics remain straightforward due to the layout of the front faceplate. A green Module OK LED illuminates continuously when the backplane power remains stable and the internal diagnostics pass.

Configuration and System Integration

The PACSystems RX3i backplane powers the IC694ALG221 card directly through its integrated bus connectors. This module interfaces seamlessly with all compatible RX3i CPUs.

The physical assembly supports hot-swapping into an active controller rack during system maintenance. However, technicians must follow safe handling procedures to protect delicate hardware traces from transient damage. Technicians perform all software calibration and parameter scaling digitally through the host controller software environment. This software control removes the need for manual trimpots or onboard physical jumpers.