I/O modules

The GE IC693CMM311E communications control module enables robust data exchange between Series 90-30 PLCs and external devices. This intelligent module features two independent serial ports supporting RS-232 and RS-485 interfaces simultaneously. The GE IC693CMM311E also provides a third port for programming or additional device connectivity. Each port operates at selectable baud rates up to 115.2 Kbps for flexible integration. The module handles multiple communication protocols including SNP, SNP-X, and Modbus RTU. This versatility allows the IC693CMM311E to connect with operator interfaces, drives, and third-party instrumentation.

Hardware Architecture and Memory Resources

The GE IC693CMM311E contains a dedicated 16-bit microprocessor for managing all communication tasks independently. This processor offloads serial handling from the main CPU, preserving processing power for control logic execution. The module includes 128 KB of battery-backed RAM for storing communication buffers and configuration data. A separate 64 KB of EPROM holds the firmware and protocol stacks for reliable operation. The IC693CMM311E also features a real-time clock for time-stamping data transactions and events. Its front panel displays six LED indicators for monitoring port activity and module status. The module measures 5.0 inches in height, 2.5 inches in width, and 4.5 inches in depth. The GE IC693CMM311E weighs approximately 1.2 pounds, making it one of the lighter intelligent modules.

The module draws 350 milliamps from the +5 VDC backplane supply for its internal circuitry. Each serial port includes optical isolation to protect against ground loop interference and voltage spikes. The IC693CMM311E uses standard 15-pin D-sub connectors for RS-232 and 9-pin D-sub for RS-485 connections. The module also offers selectable termination resistors for RS-485 multi-drop networks.

Communication Capabilities and Configuration Options

The GE IC693CMM311E supports both master and slave modes for flexible network architectures. Users can configure each port independently for different protocols and baud rates. The module handles up to 256 bytes of data per message frame for efficient data transfer. The IC693CMM311E also performs automatic parity and CRC error checking on incoming messages. Its firmware includes watchdog timer functionality that resets the module upon communication timeout. The module operates reliably across a temperature range from 0 to 60 degrees Celsius.

Complete Technical Specifications Table

Deployment Scenarios and System Integration

The GE IC693CMM311E simplifies connecting Series 90-30 systems to plant-wide information networks. This module enables data collection from remote I/O drops and distributed devices across the facility. The IC693CMM311E also facilitates firmware updates to connected devices through its programming port. Its multi-protocol capability reduces the need for external protocol converters in mixed-vendor environments. The GE IC693CMM311E stands as a proven solution for serial communication requirements in GE PLC installations.

Details