GE IC695CMU310

Technical Specifications

• Module Type: Serial Communications Interface Module
• Compatible PLC System: GE Fanuc RX3i (IC695 Series)
• Number of Ports: 2 independent serial communication ports
• Port Types:
  • Port 1: RS-232
  • Port 2: RS-485 (4-wire)
• Connector Type:
  • DB9 male for Port 1 (RS-232)
  • Terminal block for Port 2 (RS-485)
• Baud Rate Range: 300 bps to 115.2 kbps (configurable per port)
• Data Format:
  • 7 or 8 data bits
  • 1 or 2 stop bits
  • Parity: None, Even, Odd, Mark, Space
• Protocols Supported:
  • Modbus RTU Master/Slave
  • Modbus ASCII Master/Slave
  • User-Defined Protocol (via logic programming)
  • DF1 protocol for communication with Allen-Bradley devices
• Maximum Cable Length:
  • RS-232: Up to 15 meters (50 feet)
  • RS-485: Up to 1200 meters (4000 feet)
• Isolation: 1500 VAC isolation between field wiring and backplane logic
• Supported Devices per Network:
  • Modbus RTU/ASCII: Up to 247 slave devices (RS-485), 1 slave (RS-232)
• Data Buffer Size: 16 KB shared memory for message handling
• Configuration Method: Set through Proficy Machine Edition software
• Peer-to-Peer Messaging: Supports data exchange between RX3i CPUs or with other controllers
• Host Link Functionality: Enables connection to operator interfaces, programming terminals, and supervisory systems
• Error Detection and Handling: Parity, framing, and overrun error detection with status reporting
• Power Supply: 5 VDC from RX3i backplane
• Backplane Current Draw: 180 mA @ 5 VDC
• Operating Temperature: 0°C to 60°C
• Storage Temperature: -40°C to 85°C
• Humidity Range: 5% to 95% relative humidity, non-condensing
• Dimensions: 40 mm (W) x 120 mm (H) x 130 mm (D)
• Weight: Approximately 0.45 kg
• Compliance: CE, UL, CSA, RoHS, IEC/EN 61131-2

Functional Features

• Dual Independent Ports: Simultaneous operation of RS-232 and RS-485 interfaces for multi-device connectivity
• Multi-Protocol Support: Flexible configuration for Modbus RTU, Modbus ASCII, and custom serial protocols
• Master and Slave Modes: Operates as a Modbus master to poll devices or as a slave to respond to external requests
• Protocol Conversion: Translates between different serial protocols or between serial and Ethernet-based systems
• Real-Time Data Exchange: Enables high-speed messaging between PLCs, drives, and HMIs
• User-Defined Messaging: Allows creation of custom communication sequences using RX3i logic
• Broadcast Capability: Sends data to multiple devices on the same network simultaneously
• Error Logging: Stores communication faults and status information for diagnostics
• LED Indicators:
  • RUN/STOP status
  • Module fault
  • Port 1 and Port 2 transmit/receive activity
  • Communication error indication
• Hot Backup Support: Compatible with redundant CPU configurations for high-availability systems
• Online Monitoring: Communication status and data buffers viewable through Proficy software during operation

Application Areas

• Drive Control: Interfaces with variable frequency drives (VFDs) and servo drives using Modbus RTU
• HMI Connectivity: Connects to operator terminals, touchscreens, and local operator stations
• Data Acquisition: Gathers data from flow meters, temperature controllers, barcode scanners, and weighing systems
• Machine Integration: Links multiple machines or subsystems in a production line
• Legacy System Integration: Connects RX3i PLCs to older equipment with serial interfaces
• Building Automation: Communicates with HVAC controllers, energy meters, and access control systems
• Utilities Monitoring: Interfaces with substation relays, power monitors, and remote terminal units (RTUs)
• OEM Equipment: Embedded communication solution for packaging, printing, and test machines

System Integration

The IC695CMU310 installs into any slot on the RX3i universal backplane (except CPU slot) and communicates with the CPU via the high-speed VMEbus architecture. It is configured using GE’s Proficy Machine Edition software, where port settings, protocols, and message tables are defined. The module operates independently of the CPU scan cycle for reliable communication performance. Data exchange with the CPU is handled through memory mapping and logic instructions.

Environmental and Safety Compliance

• Designed in accordance with IEC/EN 61131-2 standards for programmable controllers
• Meets electromagnetic compatibility requirements per IEC/EN 61000-6-2 (industrial immunity) and IEC/EN 61000-6-4 (emissions)
• Suitable for industrial environments with protection against electrical noise, surges, and transient voltages

Maintenance and Support

The module requires no scheduled maintenance. Status LEDs and diagnostic registers enable quick identification of communication issues. Configuration changes and firmware updates are performed through standard engineering procedures using Proficy Machine Edition. Comprehensive documentation, wiring diagrams, and technical support are available through authorized GE automation partners and service networks.