GE Fanuc IC693CMM311S Communications Module

The GE Fanuc IC693CMM311S, also cataloged as the IC693CMM311S Communications Module, operates as a dedicated hardware component for industrial serial network interfacing within GE Fanuc Series 90-30 PLC platforms. This module executes point-to-point and multi-drop communication protocols, supporting RS-232, RS-422, and RS-485 physical interfaces. Designed for integration into standard Series 90-30 backplanes, it provides hardware-level execution for SNP, SNPX, and CCM protocols as well as RTU slave communication.

Hardware Specifications

Backplane Bus Communication and Serial Interface Configuration

The operational performance of the GE Fanuc IC693CMM311S depends on specific system bus integration and network transceiver management:

• Backplane Bus Communication Velocity: High-speed parallel register exchange across the Series 90-30 backplane allows low-latency data transfer between the CPU and communication buffers at 5 VDC bus logic levels.
• Protocol and Density Scaling: Port 1 dedicated RS-232 configuration combined with Port 2 software-selectable RS-422/RS-485 multi-drop capability enables multidrop topology configurations up to 4000 feet without external converters.
• Firmware Flash Compatibility: Internal microprocessor architecture maintains direct execution compatibility with Series 90-30 CPU firmware revisions for seamless register memory mapping.

Frequently Asked Questions

Q: What is the maximum current draw from the backplane for the IC693CMM311S?

A: The module draws a maximum of 400 mA from the internal 5 VDC backplane bus power supply during continuous active communication.

Q: Can the IC693CMM311S be inserted or removed while the PLC rack is powered?

A: No, hot-swapping is not supported on Series 90-30 backplanes. Power to the rack must be switched off prior to inserting or removing the module to avoid hardware damage.

Field Installation Guidelines

Installation of the IC693CMM311S in an industrial control cabinet requires strict adherence to physical and electrical guidelines:

• Ensure system backplane power is disconnected before installing or removing the module from the rack slot.
• Align the board pivot hook into the upper notch of the Series 90-30 baseplate and press firmly until the bottom connector seats completely into the backplane connector.
• Use shielded twisted-pair cables for RS-422 and RS-485 long-distance serial runs to prevent noise interference.
• Ensure signal cable shields are connected to the chassis ground terminal at one end only to eliminate ground loop currents.
• Maintain minimum physical separation between serial communication cables and high-voltage AC power lines within panel wireways.