IC697CPM790 - 64 MHz, 32-Bit Floating Point Central Processing Unit with 1 MByte Memory for IC66* Triple Modular Redundancy Systems

The IC697CPM790 is a 64 MHz, 32-bit floating point CPU designed for use in Triple Modular Redundancy (TMR) systems. This CPU is used in critical applications such as Emergency Shut-Down (ESD), fire and gas systems, and other essential industrial control environments. It provides high-speed processing, floating-point support, and redundancy capabilities to ensure reliable and continuous operation.

Key Features of the IC697CPM790

    Single Slot CPU: Occupies one slot in a rack system and includes 1 MByte of battery-backed memory, with up to 512 Kbytes available for ladder diagram application programs.
    Floating Point Support: Enables the CPU to handle floating-point calculations efficiently, making it suitable for complex industrial processes.
    Extensive I/O Capacity: Supports 12K discrete I/O in simplex mode and 2048 voted discrete I/O. It also supports 8K analog I/O in simplex mode and 1024 voted analog inputs.
    Fast Processing: Executes boolean functions in 0.4 microseconds using a 64 MHz 80486DX2 microprocessor.
    TMR Support: Essential for Triple Modular Redundancy (TMR) systems, ensuring system reliability and failure recovery.
    Firmware Upgrade via Flash Memory: The CPU uses flash memory for firmware storage, allowing for firmware updates without disassembling the module.
    Battery-backed Calendar Clock: Ensures program and data retention during power loss, supported by a battery-backed CMOS RAM.
    Configurable Memory: Allows configuration of both data and program memory, tailored to specific application needs.
    In-System Firmware Upgrades: Firmware can be updated while the system is running, minimizing downtime.
    Secure Operations: The memory protect keyswitch and password-controlled access ensure that program and configuration data can only be changed by authorized personnel.
    Four Status LEDs: These LEDs provide a clear indication of the CPU’s operational state, including RUN/STOP status and memory protection.

Memory and Flash Support

    1 MByte Battery-Backed Memory: Provides ample memory for program storage, with 512 KBytes allocated for user application programs.
    Flash Memory for Firmware: Stores the operating system firmware, allowing easy firmware updates without needing to disassemble or replace parts.

Triple Modular Redundancy (TMR)

The IC697CPM790 is designed to work within Triple Modular Redundancy (TMR) systems, ensuring maximum reliability for critical control applications. In TMR systems, multiple processors work in parallel to handle potential failures, providing continuous system operation with automatic recovery. The CPM 790 must be used in conjunction with a standalone C program that provides TMR operations and autotest routines. The module will not function unless this C program is loaded as part of the application.

Cooling Requirements

The IC697CPM790 requires forced air cooling when operating in ambient temperatures above 40°C (104°F). A fan assembly (e.g., IC697ACC721, IC697ACC724, or IC697ACC744) capable of 70 CFM is recommended for maintaining optimal performance.

Installation and Setup

Installation should follow the guidelines provided in the product manuals for safe and reliable operation. Key installation steps include:

    Connect the battery to one of the battery connectors.
    Set the toggle switch to STOP and the memory protect key to OFF.
    Ensure the rack power is off.
    Install the CPU in slot 1 of rack 0.
    Power on the system and observe the diagnostic LEDs.

Communication and Programmer Connections

    RS-485 Serial Port: The 15-pin D-connector connects to an RS-485 compatible serial port, allowing for communication with a Work Station Interface or other devices.
    Ethernet TCP/IP: Programming and communication can be achieved via Ethernet TCP/IP using an Ethernet Interface Module (IC697CMM741 or IC697CMM742). The IP address must be set in the Ethernet Interface before establishing a connection.

Conclusion

The IC697CPM790 is a powerful, high-speed CPU designed for critical control applications requiring redundancy and reliability. With floating-point support, large memory capacity, and TMR system capabilities, it ensures seamless operation in industrial automation environments. Its flexible memory configuration, in-system firmware upgrades, and multiple communication options make it a versatile and reliable choice for industries where downtime is not an option.

>> GE Fanuc IC697CPM790 User manual (pdf)

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