Communications Control Module | GE IC693CMM311F

The GE Fanuc IC693CMM311F is a high-performance communications control module engineered for Series 90-30 programmable logic controller systems. This hardware unit equips industrial setups with two independent isolated serial ports, facilitating reliable multi-protocol data exchange, peripheral device integration, and expanded network connectivity in demanding plant floor environments.

Serial Ports and Communication Capabilities

The module features two independent serial ports supporting data rates from 300 bit/s to 19.2 kbit/s. Port 1 provides an RS-232 interface via a 15-pin D-sub connector, while Port 2 offers selectable RS-232 or RS-485 connections. Supported communication protocols include SNP, SNP-X, RTU, and CCITT #16.

Buffer Management and Power Architecture

An integrated 4 KB RAM buffer handles transmit and receive queues independently without interrupting the primary PLC scan cycle. A built-in 220 µF energy storage capacitor maintains buffer data during brief power drops. The module draws 280 mA typical current solely from the backplane 5 V DC supply and features 500 V AC port isolation.

Frequently Asked Questions

Q: Can Port 2 on the IC693CMM311F be configured for long-distance networking? A: Yes, Port 2 supports a selectable RS-485 interface capable of communication distances up to 1200 meters.

Q: What happens to transmission queues during a brief power interruption? A: The built-in 220 µF energy storage capacitor retains the 4 KB buffer contents to prevent data loss during momentary brownouts.

Q: Does the module require an external power supply connection? A: No, the unit operates entirely on 5 V DC power drawn directly from the Series 90-30 system backplane.