GE IC693CMM311N Communication Modules

The GE Fanuc IC693CMM311N, also cataloged as the IC693CMM311 Communications Coprocessor Module, operates as a dedicated hardware component for offloading serial protocol execution and high-speed data transmission from the main CPU within Series 90-30 PLC systems. Installed directly into a modular CPU baseplate slot, the module processes multi-point serial communications across independent RS-232 and RS-485 interfaces via SNP, CCM, and Modbus RTU Slave protocols without increasing CPU scan cycle times.

Hardware Specifications

Backplane Bus Communication Velocity & I/O Density Scaling

Interfacing directly with the Series 90-30 logic backplane, the IC693CMM311N maintains backplane bus communication velocity by executing serial message framing, checksum verification, and protocol handshakes asynchronously. Dual independent serial ports enable simultaneous multi-drop and point-to-point topologies across expanded rack setups. Internal optical isolation barriers protect internal backplane traces from ground loop currents and transient voltage surges on serial field loops.

Frequently Asked Questions

Q: Is the IC693CMM311N compatible with Series 90-30 embedded CPU baseplates?

A: No. The module requires a modular CPU architecture (such as CPU 311, 313, 323, or 331) and does not support embedded CPU units (such as CPU 311E or 313E).

Q: Can both serial ports on the IC693CMM311N operate simultaneously on Modbus RTU?

A: Yes. Both ports can be configured independently for Modbus RTU Slave protocol execution or mixed with SNP and CCM operations.

Q: How is physical signal splitting handled for dual-port wiring on the IC693CMM311N?

A: Signal pinouts from the high-density front interface are split into independent Port 1 (RS-232) and Port 2 (RS-232/RS-485) field connections using the dedicated IC693CBL305 wye cable.

Field Installation Guidelines

1. Isolate all main power sources supplying the PLC chassis and connected external communication networks prior to module insertion.
2. Hook the upper rear latch of the IC693CMM311N into the top slot notch of a compatible Series 90-30 baseplate.
3. Press the lower portion of the module firmly into the rack until the backplane bus connector fully seats and locks into position.
4. Attach the IC693CBL305 wye cable to the front panel serial connector and secure the strain-relief thumb screws.
5. Ground all communication cable shield conductors at a single earth point to eliminate common-mode ground loop noise across fieldbus drops.