GE Fanuc IC697CPM790 GMR Redundant CPU

The GE Fanuc IC697CPM790 is a high-performance central processing unit specifically engineered for the Series 90-70 PLC family. This module excels in mission-critical environments where system availability is non-negotiable. Furthermore, it serves as the core processor for Genius Modular Redundancy (GMR) systems. By utilizing a 64 MHz 80486DX2 microprocessor, the unit delivers exceptional computational speed and reliability. This combination makes it a preferred choice for high-stakes industrial automation and safety-instrumented functions.

Advanced Redundancy and High Availability

A primary advantage of the IC697CPM790 is its native support for Triple Modular Redundancy (TMR). In this configuration, three separate PLC racks—each housing an IC697CPM790 CPU—work in parallel to ensure continuous operation. If one processor fails, the redundant system maintains control without any process interruption. Consequently, this CPU is frequently deployed in emergency shutdown (ESD) systems and fire and gas detection applications. Because it manages up to 12,000 discrete I/O points in simplex mode, it provides the scalability needed for complex plant architectures.

Processing Speed and Memory Architecture

Speed and memory management are vital for time-critical industrial processes. The IC697CPM790 achieves a rapid scan rate of 0.4 microseconds per Boolean function, allowing it to respond nearly instantaneously to field changes. Additionally, the module features 1 MB of battery-backed CMOS memory. Users can dedicate up to 512 KB of this space for logic programs, which are typically developed using ladder diagram programming or Standalone C programs. This memory structure ensures that vital data remains intact even during a total power loss.

Comprehensive Diagnostics and Security

System integrity is further enhanced by robust onboard diagnostics and security protocols. For instance, the CPU includes password-controlled access levels to protect sensitive logic from unauthorized modifications. Front-panel LEDs provide immediate feedback on the status of the CPU, memory, and communications. Moreover, the integrated calendar clock facilitates precise event logging and synchronization across the network. These features, combined with the module’s ability to interface with various smart option modules, create a comprehensive control solution for modern manufacturing.

Connectivity and Integration

Finally, the IC697CPM790 offers flexible connectivity options for programming and peripheral integration. While the module includes a built-in RS-485 port, technicians can easily connect it to standard workstations using RS-232 converters. Because it occupies a single slot in the IC697 rack, it leaves ample room for specialized communication and I/O expansion. This CPU represents a pinnacle of reliability for the Series 90-70 line, ensuring that critical industrial processes remain safe and efficient under all conditions.