GE IC693PCM311 Programmable Coprocessor Module

Technical Specifications

• Product Type: Programmable Coprocessor Module (PCM)

• Series: GE Fanuc Series 90-30 PLC

• Total Memory: 640 KB

• User Program Memory: 190 KB for MegaBasic programs

• Communication Ports: Two independent ports, electrically configurable as RS-232 and RS-485

• Supported Protocols: Modbus RTU (master), GE Fanuc CCM (master/slave), and custom protocols via C or MegaBasic

• Physical Interface: A single 25-pin female D-shell connector on the front panel, combined with a “Wye” splitter cable (IC693CBL305) for accessing both ports

• Internal Power Consumption: 750 mA from the +5 VDC PLC backplane

• Battery Backup: A lithium battery (IC693ACC301) is housed in a clip on the inside of the module’s faceplate to retain RAM program and data memory when the system is powered down

Key Functional Features

• Powerful Co-Processing: With a dedicated processor and 640 KB of memory, the PCM executes complex, time-sensitive tasks independently, relieving the host PLC’s main CPU and enhancing overall system performance .

• Dual Serial Communications Hub: Its two independent, configurable serial ports function as a versatile communications gateway, connecting the PLC system to a wide array of asynchronous serial devices such as barcode readers, scales, printers, operator display terminals, and modems for RTU master applications .

• Multi-Language Programming: Supports both MegaBasic, an interpretive BASIC language ideal for complex text manipulation and protocol conversion, and ‘C’, a compiled language suited for high-speed control algorithms and data processing .

• Flexible Memory Architecture: The module’s solid-state CMOS RAM is backed by a field-replaceable lithium battery, preserving user programs and critical data during power interruptions. The battery must be connected before installation and can be disconnected for long-term storage .

• Rack Location Restriction: The module must be installed directly in the CPU baseplate. It is not compatible with expansion or remote racks, nor with systems using embedded CPUs like the CPUs 311, 313, or 323 .

Application Scenarios

• Advanced Machine and Motion Control: The PCM handles intensive tasks like controlling servo motors or stepper motors for high-precision motion control, executing trajectory calculations and real-time adjustments .

• Data Collection and Protocol Conversion: It serves as an intelligent gateway, collecting data from and communicating with diverse serial devices like barcode scanners, weigh scales, and printers, or serving as an RTU master, often translating between proprietary protocols and the PLC’s native language .

• Complex Process Control: In demanding environments like chemical, power generation, and oil and gas industries, the PCM executes specialized control algorithms such as PID loop control or custom data analysis that require processing power beyond the main PLC’s standard scan cycle .

• Manufacturing and Industrial Automation: The module integrates into automated production lines in the automotive, food and beverage, and textile sectors, where it manages asynchronous serial peripherals and performs auxiliary logic, diagnostics, and data logging to improve line efficiency .