I/O modules

The GE IC695CMM002 serves as a dedicated serial communication module for PACSystems RX3i programmable logic controllers. This module enables reliable data exchange between the PLC and various industrial devices using multiple protocols. It consequently provides enhanced connectivity flexibility for diverse automation applications.

Physical Characteristics and Build Quality

Engineers designed this module for direct installation into RX3i Universal Backplanes with standard form factor dimensions. The unit measures approximately 13 centimeters in height, 5 centimeters in width, and 12 centimeters in depth. Its total weight reaches roughly 0.2 kilograms, making it one of the lighter communication modules in the series. The rugged enclosure ensures reliable operation in industrial control panel environments.

Technical Specifications

Serial Port Configuration

The IC695CMM002 features two independently configurable serial ports for maximum application flexibility. Each port supports either RS-232 or RS-485 electrical interfaces through software selection. You can connect devices like drives, HMIs, scales, and barcode scanners directly to these ports. The 15-pin D-sub connectors provide reliable connections with secure locking screws.

Protocol Support

This module supports multiple industrial protocols to interface with a wide range of devices. SNP protocol enables communication with other GE Series 90 PLCs for data exchange. Modbus RTU Master and Slave modes allow connectivity with thousands of Modbus-compatible devices. Serial I/O mode provides custom protocol development for specialized equipment. CCM protocol supports legacy GE communication requirements.

Isolation and Noise Immunity

Each serial port includes 1500 volts of optical isolation from the backplane and other circuits. This isolation prevents ground loops that commonly cause communication errors in industrial settings. It also protects the RX3i backplane from voltage transients on field wiring. Consequently, the IC695CMM002 maintains reliable communication even in electrically noisy environments.

Power Distribution and Filtering

The module draws 360 milliamps from the 3.3 VDC backplane supply and 190 milliamps from 5 VDC. Internal filtering capacitors smooth any voltage ripple that could affect communication stability. Dedicated power regulators ensure clean supply voltages to the serial transceivers. This careful power design contributes to error-free data transmission at maximum baud rates.

LED Status Indicators

Front-panel LEDs provide immediate visual feedback on module and communication status. A green OK LED illuminates when the module passes its power-up diagnostics and operates normally. Each serial port has dedicated TX and RX LEDs that flash during data transmission. These indicators greatly simplify troubleshooting during system commissioning.

Configuration and Programming

Engineers configure the IC695CMM002 using Proficy Machine Edition software within the RX3i project. You can set port parameters like baud rate, parity, stop bits, and protocol through simple drop-down menus. The software also allows custom serial I/O message construction for non-standard protocols. All configuration stores in non-volatile memory within the module.

Application Examples

This communication module excels in applications requiring connection to multiple serial devices. A typical installation might connect variable frequency drives via Modbus RTU on port one. Port two could simultaneously communicate with an operator interface using SNP protocol. The module handles both conversations independently without burdening the main CPU.

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