Description

The GE IC697CPX772, also cataloged as the IC697CPX772 CPU module, operates as a dedicated hardware component for logic execution and serial communication management within Series 90-70 PLC platforms.

Hardware Specifications

Backplane Bus and Firmware Compatibility

The module architecture leverages high-speed backplane bus communication to maintain deterministic scan cycles across the Series 90-70 chassis. Firmware flash compatibility ensures that the 80486DX4 processor can interface with legacy and updated rack configurations, provided the backplane power supply supports the 3.1 A current demand. The CPU manages I/O density scaling through systematic scan list updates, ensuring that both discrete and floating-point data registers are refreshed within the defined processor cycle limits. Memory protection is maintained via the onboard Lithium battery (IC697ACC701), which is required for non-volatile data retention during power cycles.

Frequently Asked Questions

Q: What is the primary function of the 3-position mode switch on the module front panel?

A: The switch allows local selection between Run, Stop, and Program modes, enabling direct control over the CPU execution state without requiring a connected programming terminal.

Q: Are the serial communication ports isolated?

A: Port 2 on the 15-pin D-shell connector features optocoupler isolation to protect the internal circuitry from ground loops and electrical transients common in RS-485 serial networks.

Field Installation Guidelines

• Ensure the Series 90-70 rack is de-energized before inserting or removing the module to prevent damage to the backplane pins.
• Verify that the rack power supply capacity exceeds the total current draw of all modules, specifically accounting for the 3.1 A load required by the CPU.
• For RS-485 communication via Port 2 or 3, ensure the shielded twisted-pair cable shield is grounded at only one end to prevent induced noise currents.
• Check the battery status periodically; the IC697ACC701 requires replacement every 6 months if power is removed, or every 5 years in shelf storage conditions to maintain the Real-Time Clock and RAM data.
• Ensure proper ventilation within the cabinet to maintain the ambient operating temperature between 0 deg C and 60 deg C.