Buyer’s Guide: Evaluating the GE IC697ALG230 Base Converter Module
Finding a reliable analog input module for a legacy Series 90-70 system is a challenge. The GE IC697ALG230 base converter module solves that problem by delivering high-level analog signal processing with flexible expansion. This module was formerly manufactured by GE Fanuc Automation and is now under Emerson Automation. It serves as the foundation of a scalable analog input system, supporting up to seven expander modules for a maximum of 120 inputs.
What the IC697ALG230 Actually Does
The IC697ALG230 is a base converter module for the Series 90-70 Programmable Logic Controller platform. It provides eight differential inputs that you can configure individually for voltage or current signals. The module accepts a 4-20 mA current signal and a -10 VDC to +10 VDC voltage signal. Each channel offers 16-bit analog output resolution, giving you precise measurement for demanding process control tasks.
Key Technical Parameters
| Specification | Value |
|---|---|
| Brand / Series | GE Fanuc / Series 90-70 |
| Channels | Eight (8) differential analog inputs |
| Input Signals | 4-20 mA; -10 VDC / +10 VDC |
| Voltage Input Range | -10 to +10 Volts |
| Current Input Range | 4 to 20 milliamps |
| Resolution | 16 bits |
| Update Rate | 2.4 ms to 2.8 ms |
| Terminals | 40 pins |
| Wiring | Differential |
| Expander Support | IC697ALG440, IC697ALG441 |
| Max Inputs | 120 |
| Lifecycle Status | Discontinued |
Why the Differential Input Design Matters
Differential wiring measures the difference between two reference wires. This approach delivers greater resistance against electromagnetic interference. In critical systems where accurate measurement is a consistent necessity, differential inputs reduce noise and improve signal integrity. The IC697ALG230 also includes individual low-pass filters on each channel and an opto-isolation circuit that provides module isolation to the PLC backplane.
Response Time and Accuracy for Demanding Applications
The module offers response times of 30 milliseconds at 5.0%, 42 milliseconds at 1.0%, 51 milliseconds at 0.5%, and 67 milliseconds at 0.1%. Voltage accuracy is ±0.01% of full scale and ±0.02% of value. Current accuracy is ±0.05% of full scale and ±0.1% of value. Linearity is ±0.02% of full scale over the entire negative to positive range. These specifications make the module suitable for applications that require consistent, repeatable analog measurements.
Scaling Your System with Expander Modules
The base converter module includes an expansion port for connecting voltage or current expander modules. The IC697ALG440 voltage expander and IC697ALG441 current expander each add sixteen channels of the same signal type. You can connect up to seven expander modules, bringing the total system capacity to 120 inputs. A serial communication port controls the expanders through the processor of the base converter module.
Installation and Setup Guidance
The IC697ALG230 comes with a removable 40-terminal connector block on the front face. A jackscrew driver removes the base for easy wiring access. A door insert allows you to write short input descriptions for quick identification. The module uses MS-DOS Windows configuration software to program each input according to application needs. The software also provides data commands to modify configuration parameters through ladder logic.
Maintenance and Reliability Considerations
Because the IC697ALG230 is discontinued, buyers should verify current lifecycle status and availability with SpareTechPLC before ordering. For units already in service, inspect the terminal connections periodically and confirm that the module remains properly seated in the rack. Keep the installation environment free of excessive heat, moisture, and vibration to extend module life. Follow the manufacturer’s safety manual for all maintenance activities.
Compatibility and Integration
The IC697ALG230 integrates with the Series 90-70 PLC platform. It works with the IC697ALG440 voltage expander and IC697ALG441 current expander modules. The module provides CPU alarm interrupts and CPU fault reporting on a per-channel basis. This allows the processor to respond quickly to fault conditions and maintain system reliability.
What to Verify Before You Buy
Before purchasing the IC697ALG230, confirm that your application requires 4-20 mA or -10 VDC to +10 VDC input signals. Check whether you need expander modules to reach your required channel count. Verify that your existing Series 90-70 rack can accommodate the module. Since the product is discontinued, contact SpareTechPLC to confirm availability and discuss replacement options for your specific system configuration.
Frequently Asked Questions
Q: How many inputs can the IC697ALG230 support with expander modules?
A: The base module has eight differential inputs. With seven expander modules connected, the system can handle up to 120 inputs.
Q: What signal types does the IC697ALG230 accept?
A: Each channel is individually configurable for 4-20 mA current signals or -10 VDC to +10 VDC voltage signals.
Q: Is the IC697ALG230 still in production?
A: No. The IC697ALG230 is discontinued. Contact SpareTechPLC to verify availability and explore replacement options.
Q: What expander modules work with the IC697ALG230?
A: The IC697ALG440 voltage expander and IC697ALG441 current expander modules are compatible.
Q: What is the update rate of the IC697ALG230?
A: The module provides an update rate of 2.4 ms to 2.8 ms.
