Description
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Product | IC697CPX928-CD |
| Series | GE Fanuc Series 90-70 |
| Module Type | Central Processing Unit |
| Processor | 80486DX4, 32-bit |
| Processor Speed | 96 MHz |
| Boolean Execution | Approximately 0.4 µs per Boolean function |
| Memory | 6 MB battery-backed RAM |
| Non-volatile User Flash | 256 KB |
| Maximum I/O | 12K inputs/outputs, any mix |
| Maximum Analog I/O | Up to 8K |
| Serial Port 1 | RS-232 compatible |
| Serial Port 2 | RS-485 compatible, optically isolated |
| Serial Port 3 | RS-485 compatible, non-isolated |
| 5 V Bus Current | 3.1 A nominal |
| Battery | IC697ACC701 lithium battery |
| Operating Temperature | 0–50°C without forced-air cooling; higher-temperature operation requires rack cooling provisions |
| Rack Position | Slot 1 / CPU slot |
GE’s technical documentation specifies the 96 MHz processor, 6 MB battery-backed memory, 256 KB non-volatile user flash, 12K total I/O capacity, and three serial interfaces. Port 2 is optically isolated RS-485 while Port 3 is non-isolated RS-485.
Product Introduction
The GE Fanuc IC697CPX928-CD is a Series 90-70 central processing unit designed to execute PLC application logic and coordinate the control system’s rack-based I/O. Its 96 MHz 80486DX4 processor, floating-point capability, 6 MB battery-backed memory, and three serial ports made the CPX928 a substantial processor for its generation. It supports IC697 as well as IC660/IC661 I/O architectures.
For a maintenance team keeping an established Series 90-70 installation operational, the important point is compatibility rather than simply finding a processor with similar specifications. The CPU stores application and configuration data, depends on its battery for memory retention, and communicates with programming or serial devices through defined port configurations. The exact -CD revision should therefore be matched before replacement.
IC697CPX928-CD
Application Scenarios & Field Pitfalls
Engineering Pain Point
A failed CPX928 can stop an entire Series 90-70 control rack even when the connected I/O modules remain functional. Replacement is therefore not just a matter of matching the CPU’s catalog number; the application program, hardware configuration, firmware compatibility, battery condition, serial-port wiring, and rack environment all need attention.
Typical Applications
- Series 90-70 PLC control: Executes application logic and manages distributed rack I/O.
- Legacy process automation: Suitable for established machinery, process skids, utility systems, and plant control installations using Series 90-70 architecture.
- IC660/IC661 I/O systems: Provides CPU-level support for compatible Genius-related I/O architectures.
- Serial programming and integration: Three serial ports provide RS-232 and RS-485 connectivity for supported devices and programming functions.
Technical Pitfalls to Avoid
- Do not treat IC697CPX928-CD as a generic CPU substitute.
The CPX928 belongs specifically to the Series 90-70 architecture. Confirm the rack, I/O configuration, firmware revision, and application software before installation. - Check the battery before transferring or relying on stored memory.
The 6 MB RAM is battery-backed. GE documentation specifies the IC697ACC701 battery and warns that memory retention without applied power is limited. A battery replacement should be planned carefully to avoid losing the existing application. - Do not assume all three serial ports are electrically identical.
Port 1 is RS-232, Port 2 is optically isolated RS-485, and Port 3 is non-isolated RS-485. Existing cable pinouts and grounding arrangements should be checked against the actual port being used.
Related Products
- IC697CPX928 — Base CPX928 CPU model; the fundamental technical platform for the
-CDrevision. - IC697CPX928-AA — Earlier CPX928 revision; verify revision compatibility before substitution.
- IC697CPX928-CA — Another configured CPX928 revision used in Series 90-70 replacement programs.
- IC697ACC701 — Lithium battery used to maintain CPU memory and the calendar clock.
- IC697CMM741 — Series 90-70 Ethernet TCP/IP communications module used when Ethernet connectivity is required.
- IC697CMM742 — Ethernet communications module for Series 90-70 programming and network communications.
- IC697 I/O modules — Native Series 90-70 discrete, analog, and specialty I/O family.
- IC660 / IC661 I/O — Compatible legacy I/O architectures supported by the CPU.
Procurement and Replacement Notes
When sourcing IC697CPX928-CD, request photographs of the CPU label when revision matching matters. Confirm the complete catalog number, hardware revision, firmware/application version, battery condition, and whether the replacement must preserve an existing application program.
For an installed machine, it is also worth documenting the CPU’s current keyswitch position, serial-port usage, rack configuration, and program backup before removing the original module. The GE documentation specifies that the CPU occupies a single rack slot and is intended for the CPU position of the Series 90-70 system.
