GE IC693CMM311 Communication Coprocessor Module for Series 90-30 PLC

Product Overview

When your legacy automation system requires reliable communication between controllers and field devices, the GE IC693CMM311 communication coprocessor module delivers proven connectivity. Part of the Series 90-30 family, this module was originally manufactured by GE Fanuc and is now supported by Emerson Automation. It provides two serial ports that support multiple electrical standards and protocols, making it a versatile solution for integrating older PLC systems.

Technical Specifications

The IC693CMM311 operates with a bus voltage of +5VDC and draws a backplane current of 400 mA. It has two communication ports: Port 1 supports RS232, while Port 2 supports RS232, RS422, and RS485 electrical standards. Both ports use 25-pin D-shell female connectors. The module supports CCM, RTU, and SNP communication protocols at baud rates of 300, 600, 1200, 240, 4800, 9600, and 19200. Status LED indicators include Module OK, PORT1, and PORT2. The module occupies a single slot in the CPU baseplate, and up to four CMM modules can be installed per baseplate.

Industry Applications

In manufacturing environments where Series 90-30 PLCs control assembly lines or material handling systems, the IC693CMM311 enables seamless data exchange between the PLC and remote terminal units (RTUs) or operator interfaces. For example, using RTU protocol on Port 2 allows connection to Modbus-compatible devices, while CCM protocol on Port 1 maintains communication with GE Fanuc HMIs. This module is ideal for upgrading older systems without replacing the entire controller.

Installation & Setup Guidance

Mount the IC693CMM311 in any slot of the Series 90-30 CPU baseplate except the CPU slot. Use the pre-assembled Wye cable (IC693CBL305) to separate the two ports for easier wiring. Configure the module using the default setup or configuration software. A push button on the module allows you to restart communication without power cycling the entire system, which minimizes downtime during setup changes.

Compatibility & Integration

The IC693CMM311 is compatible with modular GE Series 90-30 CPUs, including models 331 and later. It supports SNP, Modbus RTU, and CCM protocols. Port 1 is dedicated to RS-232 applications, while Port 2 supports both RS-232 and RS-485 applications. The module cannot be used with embedded CPUs such as the 311, 313, or 323. For systems requiring multiple communication channels, up to four CMM modules can be installed in a single baseplate.

Maintenance & Reliability

Given the IC693CMM311 is discontinued, regular inspection of the LED indicators (Module OK, PORT1, PORT2) helps verify operational status. Ensure the backplane current draw does not exceed the power supply capacity. Because this module is no longer in production, verify current lifecycle status and availability with BluePLC Industrial before ordering. Proper handling and storage in a clean, dry environment will extend the module's service life.

Selection Guide & Purchasing Advice

Before purchasing the IC693CMM311, confirm your Series 90-30 CPU is a modular type and that you have an available slot in the CPU baseplate. Order the IC693CBL305 Wye cable separately if needed. BluePLC Industrial offers this discontinued module with verified functionality and fast shipping. Contact our team to check stock and discuss replacement options if the module is no longer available.