GE IC693CMM311T: Communications Control Module

This communications module manages data exchange between PLCs and external devices. It handles serial messaging and network bridging for automation systems. The GE IC693CMM311T suits GE Series 90-30 programmable logic controllers. You can deploy this unit for multi-vendor equipment integration.

Technical Parameters Overview

Communication Port Architecture

Furthermore, the GE IC693CMM311T provides three independent serial interfaces. Two RS232 ports support point-to-point connections to HMI panels. One RS485 port allows multi-drop networking with up to 32 devices. Each port operates at selectable baud rates up to 115.2 kbps. Therefore, you can connect barcode scanners, printers, or variable frequency drives.

Internal Processing and Data Handling

A 32-bit processor manages all communication tasks for this module. This processor includes 128 KB of dedicated buffer memory. The buffer stores incoming messages before sending them to the PLC. Meanwhile, five capacitors store 1,250 µF of total energy. That storage maintains data integrity during momentary power dips. Consequently, the GE IC693CMM311T prevents message corruption on unstable power lines.

Component Layout and Signal Isolation

Moreover, 156 discrete components occupy two stacked printed circuit boards. The upper board hosts the processor and memory devices. The lower board contains optocouplers and line driver circuits. Optical isolation provides 1000 VDC separation between field wiring and backplane logic. This isolation protects the PLC from ground loop currents. The GE IC693CMM311T also includes transient suppression diodes on every port.

Protocol Support and Configuration Flexibility

For device compatibility, this module understands three industrial protocols. Modbus RTU allows connection to thousands of third-party instruments. SNP protocol enables direct communication with GE HMI terminals. Serial I/O mode supports custom ASCII string handling. You can configure each port independently for different protocols. As a result, one module talks to diverse equipment simultaneously.

Backplane Interface and System Integration

The rear edge connector plugs into any Series 90-3 slot. This connection carries power, data, and interrupt signals. The GE IC693CMM311T draws 250 mA from the 5 VDC supply. A hardware watchdog timer resets the processor if communication freezes. You can place this module anywhere in the I/O rack. For example, position it near the CPU for faster response times.