GE IC697ALG230 Module: Key Specs & Differential Inputs

Introduction to the GE IC697ALG230 Base Converter Module

The GE IC697ALG230 base converter module is a critical component in the Series 90-70 PLC platform, originally from GE Fanuc and now under Emerson Automation. This module supports eight differential analog inputs, each configurable for voltage or current signals. Engineers can leverage its 16-bit ADC for precise measurements in high-level analog systems. The module also allows connection of expander modules IC697ALG440 and IC697ALG441 to increase channel count up to 120. This article examines the technical principles behind the GE IC697ALG230 and its role in industrial automation.

Technical Highlights of the GE IC697ALG230

The GE IC697ALG230 employs a differential wiring configuration to resist electromagnetic interference (EMI). The module measures the signal difference between two reference wires, ensuring accurate readings in noisy environments. Each channel includes an individual low-pass filter and opto-isolation to protect the PLC backplane. The built-in analog-to-digital converter (ADC) converts digital data with 14-bit resolution, while the overall system achieves 16-bit analog output resolution. The module provides fast update rates between 2.4 ms and 2.8 ms, making it suitable for time-critical applications.

Input Configuration and Ranges

Users can configure each of the eight inputs independently for voltage or current. The voltage input range spans -10 V to +10 V with ±0.01% full-scale accuracy. The current input range covers 4 mA to 20 mA with ±0.05% full-scale accuracy. The module also supports factory calibration at 10 V ±2 mV, ensuring consistent performance. The linearity remains within ±0.02% of full scale over the entire range, and the temperature coefficient stays low at ±5 PPM/°C typical for voltage.

Expander Module Integration

The GE IC697ALG230 includes an expansion port for connecting up to seven expander modules. The IC697ALG440 voltage expander and IC697ALG441 current expander each add eight channels, enabling a maximum of 120 inputs. The base converter module controls the expanders via a serial communication port. This modular design reduces wiring complexity and allows engineers to scale the system as needed. The removable 40-terminal connector simplifies field wiring and maintenance.

Diagnostics and Configuration

The GE IC697ALG230 supports per-channel CPU alarm interrupts and fault reporting. The MS-DOS Windows configuration software lets users program each input and modify parameters via ladder logic. The software provides data commands for real-time adjustments. The module also includes a door insert for labeling input descriptions, improving identification during troubleshooting.

In summary, the GE IC697ALG230 offers a robust solution for analog input applications requiring flexibility, accuracy, and EMI resistance. Its differential architecture, fast update rates, and expandability make it a valuable component in Series 90-70 systems. Engineers can rely on its precise calibration and high linearity for critical process control tasks.