GE Fanuc IC693CMM311 Communication Co-Processor Module CCM/RTU/SNP

Module Overview

The IC693CMM311 is a high-performance communication co-processor designed to expand the connectivity of GE Fanuc Series 90-30 PLC systems. Unlike standard CPU ports, this dedicated module offloads communication tasks from the main processor, ensuring that high-speed logic execution is not compromised by heavy data traffic. It supports multiple industrial protocols, including GE Fanuc CCM, Modbus RTU (Slave), and SNP/SNPX, making it a versatile bridge for interfacing with HMIs, third-party PLCs, and SCADA systems.

Detailed Technical Specifications

The IC693CMM311 provides two independent serial ports, each configurable for specific physical layers and protocols to suit diverse networking requirements.

Port Configuration and Connectivity

The dual-port architecture of the IC693CMM311 allows for simultaneous communication. Port 1 is strictly RS-232, typically used for local HMI or PC connections over short distances. Port 2 offers flexibility, supporting either RS-232 or RS-485. The RS-485 capability is essential for multi-drop networking, allowing the module to act as a node in a larger industrial bus system extending up to 4,000 feet.

Hardware Compatibility Note

This module requires a modular CPU baseplate for installation. It is not compatible with "Embedded" Series 90-30 CPUs like the 311 or 313 in their standard fixed-base versions; it must be utilized within a standard Rack 0 or Expansion Rack with a modular CPU.

Technical FAQ

Does the IC693CMM311 support Modbus Master mode?

Standard firmware for the IC693CMM311 supports Modbus RTU Slave. For Modbus Master capabilities, users generally look to the IC693CMM321 (Ethernet) or specialized firmware versions, though the CMM311 remains the primary choice for CCM and SNP high-speed slave telemetry.

How many CMM modules can be installed in a single rack?

While the system architecture allows multiple modules, the limiting factor is the 400 mA current draw from the 5V power supply bus. Ensure the system power supply (e.g., IC693PWR321) has sufficient headroom for the combined load of all modules.