IC697CGR772 - 96 MHz, 32-Bit Floating Point, 512 KByte Memory Central Processing Unit for CPU Redundancy Applications

The IC697CGR772 is designed specifically for CPU redundancy applications, providing robust performance with a 96 MHz 80486DX4 microprocessor and 512 KBytes of battery-backed fast CMOS RAM. This single-slot CPU is ideal for mission-critical systems requiring redundancy and seamless switching between primary and backup controllers.

Key Features of IC697CGR772

    Redundancy Support: Enables bumpless switching between redundant PLCs for high availability and system reliability.
    Synchronization: Keeps CPUs synchronized for redundant operation with backup communication channels.
    High-Performance Processor: Operates at 96 MHz with 0.4 microseconds per boolean function, ensuring fast, reliable control.
    Memory: Features 512 Kbytes of fast, battery-backed CMOS RAM and supports configurable data and program memory.
    I/O Support: Handles 2048 inputs and outputs and up to 8K analog I/O, providing ample capacity for complex systems.
    Multiple Serial Ports: Equipped with three serial ports, including RS-232 and RS-485 for flexible communication options.
    Redundant Features: Includes online programming, manual and automatic switching, and on-line repair without halting system operations.
    Error Detection: Built-in memory parity and checksum routines ensure data integrity.

Redundancy and Backup

The CGR772 is critical for CPU redundancy applications, offering:

    Bumpless switching between the primary and backup controllers, reducing downtime and ensuring continuous operation.
    Synchronization between the primary and secondary CPUs, ensuring that both systems operate seamlessly together.
    Configurable backup data size for tailored redundancy options, and the ability to manually switch with a push-button switch.

Installation and Configuration

Installing and configuring the IC697CGR772 involves the following steps:

    Battery Connection: Connect the battery to one of the connectors on the module to ensure memory retention.
    Toggle Switch: Set the toggle switch to the STOP position before installation.
    Memory Protection: Ensure the memory protection keyswitch is set to OFF before programming.
    Slot Installation: Install the CGR772 module in slot 1 of rack 0 and power on the system.
    LED Indicators: The module's OK LED will blink during diagnostics and remain on if successful.

The CPU is ready to be programmed once it passes diagnostics. The three-position RUN/STOP switch allows control over system operation, and the seven LEDs display status information such as memory protection and serial port activity.

Communication Ports

The IC697CGR772 supports three communication ports:

    Port 1 (RS-232): RJ-11 connector for serial communication.
    Port 2 (RS-485): Optocoupler isolated, providing differential signals for robust communication.
    Port 3 (RS-485): Non-isolated, providing additional communication flexibility.

Ethernet TCP/IP Connectivity

For programming over Ethernet TCP/IP, an Ethernet Interface Module (such as IC697CMM741) must be installed. The IP address must be configured before connecting the CPU to the network, enabling remote programming and control via Ethernet.

Battery and Memory Protection

A lithium battery ensures the retention of program and data memory when the system is powered off. Memory protection features include a keyswitch that prevents unauthorized access to memory changes, providing an additional layer of security for critical operations.

Conclusion and Recommendations

The IC697CGR772 is ideal for redundant PLC systems in high-reliability environments such as industrial automation or critical infrastructure. Its fast processing, redundancy features, and flexibility in communication make it a key component for fault-tolerant systems.

For projects requiring minimal downtime and high system availability, the IC697CGR772 offers seamless redundancy with its bumpless switching, ensuring that even in the event of a failure, system operations continue without disruption.

>> GE Fanuc IC697CGR772 User manual (pdf)

++ Other 90-30 PLC modules

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