IC697CPU780   GE Central Processing Unit (CPU) module

The IC697CPU780 module is an expandable CPU module that is made for hot standby CPU applications. It can be used in PLCs from GE Fanuc which form part of the Series 90-70 family of GE PLCs. Redundancy features supported by the IC697CPU780 module include bumpless switching between PLCs, CPU synchronization, 20 milliseconds of scan extension, one scan switching, one-line repair, and programing and memory parity and checksums. The other standard features supported by the IC697CPU780 module include a 16 megahertz 80386DX processor, 12 thousand inputs and outputs, 8 thousand analog I/O, up to 512 kilobytes of memory, software configuration, password-controlled access, and 4 status LEDs. The options for system memory include 128 kilobytes, 256 kilobytes, 256 kilobytes with 256 kilobytes of non-volatile flash, or 512 kilobytes of total system memory.

The shelf life of the battery which provides backup power to the system memory is 10 years at 68 degrees Fahrenheit. The IC697CPU780 module draws 1.6 Amps of current from the system bus. The module is compatible with 5 Volts DC input voltage. The IC697CPU780 module is primarily used as a CPU in a hot standby CPU redundancy system which requires 2 CPUs: 1 CPU in the primary PLC and 1 CPU in the secondary PLC. The primary and backup CPUs need to be configured separately. One is configured as the primary CPU and the other is configured as the secondary CPU. Communication between the primary and secondary PLCs is achieved through the use of bus transmitter modules and redundancy communication modules. The serial port on the IC697CPU780 module with a 15-pin D-connector can be used to interface with the RS-485 serial port for making serial connections to a programming computer.87