GE IC693CMM311T

Designed for Series 90-30 Connectivity

The GE Fanuc IC693CMM311T serves as a communication coprocessor for GE Fanuc Series 90-30 modular PLC systems. Instead of acting as a general-purpose CPU, it focuses on handling external serial communications and expanding the connectivity capabilities of the host controller.

This makes the module a practical choice for plants that continue to operate established Series 90-30 control systems and need to replace an existing communications board.

Communication Capabilities

One of the main advantages of the IC693CMM311T is its support for several communication standards.

Port 1 is designed for RS-232 applications. Port 2 provides additional flexibility because it can support RS-232 or RS-485 communication. The module also supports GE Fanuc CCM, SNP, and RTU Modbus communication protocols.

Furthermore, communication parameters such as data rate, parity, and other protocol-related settings can be configured according to the application requirements. Available documentation lists communication rates from 300 through 19,200 baud for supported configurations.

Important Specifications

The IC693CMM311T operates from the Series 90-30 backplane and has a reported internal power requirement of 400 mA at 5 VDC. It occupies a single module slot and uses a 25-pin D-shell interface for its serial connections.

The module is intended for modular Series 90-30 CPUs rather than embedded CPU configurations. Therefore, system compatibility should always be confirmed before purchasing or installing a replacement.

Hardware Design

The board combines the communication processing circuitry, interface electronics, status indicators, and backplane connection required for integration into a Series 90-30 PLC rack.

Its two-port design is useful when a PLC needs to communicate with more than one serial device or when different communication interfaces are required within the same control system. The module also includes status indicators that help technicians identify module and communication conditions during troubleshooting.

Where It Fits Best

The IC693CMM311T can be applied in a variety of legacy automation environments, including:

• Production and assembly lines
• Industrial machinery
• Process monitoring
• Factory data collection
• PLC-to-device communications
• Water and utility control systems
• Existing SCADA networks

For maintenance teams, the module is especially valuable when replacing a failed communications component while retaining the existing PLC architecture.

Maintenance Tips

When servicing the IC693CMM311T, first inspect the module, connectors, and communication cables for physical damage. Next, verify the configured protocol and serial parameters against the requirements of the connected equipment.

If communication problems occur, check the Port 1 or Port 2 interface, cable wiring, station settings, baud rate, and protocol configuration. Keeping a correctly matched spare module can also make repairs faster and minimize production interruptions.

For replacement projects, always verify the complete model and revision, because different revisions may have different firmware or functional characteristics. Available listings identify IC693CMM311T as the T revision of the IC693CMM311 family.

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