GE IC697CPU780 Central Processing Unit Module

GE Fanuc IC697CPU780 CPU Module

Overview

The IC697CPU780 is a central processing unit (CPU) module from the Series 90-70 Programmable Logic Controller (PLC) platform, originally manufactured by GE Fanuc and currently under Emerson Automation. This single-slot CPU module is designed primarily for hot standby (redundant) configurations, ensuring high availability and minimal downtime in critical applications.

Key Features

• Processor: Embedded 16 MHz 80386DX microprocessor

• Boolean Execution Time: 0.4 microseconds per boolean instruction

• Memory:

• Discrete I/O memory: 12 KB

• Analog I/O memory: 8 KB

• Maximum total memory: Up to 512 KB (configurable options include 128 KB, 256 KB, 256 KB + 256 KB non-volatile flash, or 512 KB)

• Floating Point Math: Supported

• Communication: RS-485 serial interface with 15-pin D-connector for programming and communication

• Redundancy: Supports hot standby with bumpless switching, CPU synchronization, one scan switching, online programming and repair, and configurable backup data size

• LED Indicators: Module OK, RUN, Outputs Enabled, Memory Protect Activated

• Battery Backup: Uses lithium battery IC697ACC701 with 10-year shelf life at 20°C, retaining data for up to 6 months

• Operating Voltage: 5 V DC

• Current Draw: 1.6 Amps

• Mounting: Slot 1 of rack 0, compatible with VME standard C.1

Description

The IC697CPU780 module is built for applications requiring high system availability through redundant (hot standby) CPU operation. It pairs a primary CPU with a secondary CPU, enabling automatic and seamless control transfer without downtime in the event of primary CPU failure or mode change from RUN to STOP.

The 16 MHz 80386DX processor delivers fast Boolean logic execution (0.4 µs per function), supporting complex control tasks including floating-point calculations. The CPU can manage up to 12 KB of discrete I/O and 8 KB of analog I/O signals, with memory expandable up to 512 KB.

This CPU module includes four LED status indicators for easy monitoring and troubleshooting, and it features an embedded RS-485 communication port used for programming, diagnostics, and CPU communication.

The lithium battery backs up volatile memory, ensuring data retention for up to six months without power. The battery has a 10-year shelf life at standard room temperature.

The IC697CPU780 supports redundancy features including automatic CPU synchronization, bumpless switching, one scan switching, and online programming and repair, all designed to eliminate single points of failure in critical control systems.