GE IC693CMM311K Communications Module

This module enables serial communication between Series 90-30 PLCs and external devices. The GE IC693CMM311K provides two configurable ports for industrial networks. It measures 125 mm in width and 110 mm in height. This unit weighs approximately 0.30 kg for rack mounting.

Technical Specifications Table

Parameter	Value
Product Model	GE IC693CMM311K
Brand	GE Fanuc / Emerson
Category	Communications Control Module
Compatible Series	GE Series 90-30
Number of Ports	2
Port 1 Type	RS232 (15-pin SUB-D), software configurable
Port 2 Type	RS422/485 (15-pin SUB-D), software configurable
Baud Rate Range	300 to 38400 bps
Protocols Supported	Modbus RTU, RTU Slave, SNP, SNP-X
Dimensions (W x H x D)	125 mm x 110 mm x 55 mm
Weight	0.30 kg
Connector Types	2 x 15-pin SUB-D
Internal Components	1 x 16-bit CPU, 2 x UARTs, 1 x flash memory
User Memory	128 KB flash for firmware
Runtime Memory	32 KB SRAM for buffering
Energy Storage	None (volatile buffers reset on power loss)
Electrical Isolation	500 V AC between ports and backplane
Operating Voltage	5 V DC (from backplane)
Power Consumption	300 mA maximum
LED Indicators	6 x status (Power, OK, Port1 Active, Port2 Active, Fault)
Operating Temperature	0°C to 60°C

Internal Design and Communication Processing

This communications module uses a 16-bit CPU for protocol handling and buffering. Two UARTs manage simultaneous communication on both serial ports. The GE IC693CMM311K supports Modbus RTU and GE SNP protocols for industrial networks. Flash memory stores the module’s firmware for field updates. The module buffers incoming and outgoing data in 32 KB of SRAM. Consequently, this module enables reliable data exchange between PLCs and external devices.

Installation and Configuration Guide

First, mount this module into any Series 90-30 rack slot. Next, connect your serial devices to the 15-pin SUB-D ports using shielded cables. Then, configure each port’s baud rate and protocol using the PLC programming software. Use RS232 for short-distance connections up to 15 meters. Use RS422/485 for long-distance networks up to 1200 meters. The module automatically buffers incoming messages for the CPU. Six LED indicators show power, OK status, port activity, and fault conditions. This communications module works with all Series 90-30 CPU models including 311, 331, 341, 363, and 364. Always terminate the RS422/485 line with proper resistors for long cable runs.