Buy now IC693CMM311 GE Fanuc Communications Coprocessor
The IC693CMM311 is a highly versatile Communications Coprocessor Module (CMM) manufactured by GE Fanuc for the robust Series 90-30 Programmable Logic Controller (PLC) architecture. This module acts as an intelligent peripheral device, specifically engineered to offload communication processing tasks from the main PLC CPU. By doing so, it significantly enhances the overall scan time and performance of the control system. The IC693CMM311 provides two independent serial communication ports, allowing the Series 90-30 system to interface seamlessly with a wide array of third-party devices, HMIs (Human Machine Interfaces), supervisory control and data acquisition (SCADA) systems, and barcode readers. It supports multiple industry-standard protocols, including SNP, SNP-X, CCM, and Modbus RTU, ensuring maximum interoperability on the factory floor.
Technical Specifications
- Part Number: IC693CMM311
- Manufacturer: GE Fanuc
- Platform Compatibility: Series 90-30 PLC
- Port Configuration: Port 1 (RS-232), Port 2 (RS-485 / RS-422)
- Supported Protocols: Modbus RTU, SNP, SNP-X, CCM
- Maximum Baud Rate: Up to 19.2 Kbps per port
- Power Requirements: 300 mA from the 5 VDC backplane
Expert Tips for Network Integration
When deploying the IC693CMM311 in electrically noisy industrial environments, communication integrity is paramount. For Port 2, which utilizes RS-485/RS-422 differential signaling, it is absolutely critical to use high-quality twisted-pair shielded cables. The shield should be grounded at one end only—typically at the PLC rack—to prevent ground loops that could induce data corruption. Additionally, always ensure that proper terminating resistors (usually 120 ohms) are installed at the physical ends of the RS-485 daisy chain to eliminate signal reflection and impedance mismatch, which are common causes of intermittent communication dropouts.
Maintenance and Configuration Advice
The configuration of the IC693CMM311 is handled directly through the PLC programming software (such as Logicmaster 90 or Proficy Machine Edition). When setting up the module, double-check that the port settings (baud rate, parity, stop bits) exactly match the slave or master devices. From a maintenance perspective, this module requires minimal physical upkeep. However, periodically inspecting the serial connector pins for oxidation or bent contacts is recommended. If the STAT LED flashes red, it indicates a hardware or configuration failure that requires immediate attention.
Related Control Components
To build a fully integrated control node, this communications coprocessor operates flawlessly alongside advanced processing units like the IC693CPU364, expanding the system’s serial capabilities while the CPU handles Ethernet traffic.
Frequently Asked Questions (FAQs)
Q: Can I use both ports on the IC693CMM311 simultaneously?
A: Yes, both Port 1 (RS-232) and Port 2 (RS-485) can be active at the same time, operating independently with different protocols and baud rates if properly configured.
Q: Which slot in the Series 90-30 baseplate can hold this module?
A: The IC693CMM311 can be installed in any available I/O slot in the CPU baseplate or in an expansion baseplate, but not in a remote baseplate.
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