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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Processor | 96 MHz 80486DX4 |
| User Memory (RAM) | 6 Mbytes battery-backed |
| Non-volatile Flash | 256 KB |
| Boolean Execution Speed | 0.4 µs per Boolean function |
| Floating Point | Yes |
| Discrete I/O | Up to 12K (any mix) |
| Analog I/O | Up to 8K |
| Serial Ports | 1× RS-232 + 2× RS-485 (one optically isolated) |
| Power Requirement | 3.1 A nominal from +5 V bus |
| Operating Temperature | 0–60 °C with 70 CFM forced air; 0–50 °C without |
| Battery | IC697ACC701 lithium (shelf life ~5 years at 20 °C) |
| Slots Occupied | 1 |
| Configuration | Software only – no jumpers or DIP switches |
4. Product Introduction
The IC697CPX928 is a high-performance single-slot CPU for the GE Fanuc Series 90-70 platform. It uses a 96 MHz 80486DX4 processor with floating-point support and delivers 0.4 µs Boolean execution. On-board memory consists of 6 Mbytes of battery-backed RAM plus 256 KB of non-volatile user flash.
It supports up to 12K discrete I/O points (any mix) and 8K analog I/O, and includes three serial ports for programming and communications. The module is designed for real-time control of machines, processes, and material-handling systems and communicates with I/O over the VME backplane. Forced-air cooling is required above 50 °C.
IC697CPX928
IC697CPX928
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No LEDs / CPU will not power up | Missing +5 V or backplane problem | ✅ High | Measure +5 V at the backplane; check rack power supply | Verify power and seating before replacing the CPU |
| CPU OK LED off / Fault indicated | Hardware fault or severe configuration error | ✅ High | Read diagnostic buffer; note LED pattern | Clear faults if possible; persistent faults usually require replacement |
| Memory loss after power cycle | Battery depleted or missing | ✅ High | Check battery age/voltage; confirm IC697ACC701 installed | Replace lithium battery; retention is ~6 months without power |
| Overtemperature shutdown | Insufficient forced air above 50 °C | ✅ High | Confirm 70 CFM fan is running and filters are clean | Install or repair forced-air cooling |
| Serial ports unresponsive | Cable, baud rate, or protocol mismatch | ⚠️ Medium | Verify cable type and port settings against previous CPU | Mirror exact serial parameters; test with known-good cable |
| Program will not retain | Flash write failure or battery issue | ⚠️ Medium | Attempt store-to-flash; check battery status | Replace battery first; if still fails, replace CPU |
If power, battery, and cooling checks do not resolve the issue, replace the IC697CPX928. Always power the rack down and observe proper ESD practices when handling the module.
6. Frequently Asked Questions (FAQ)
Q: How much user memory does the IC697CPX928 provide? A: 6 Mbytes of battery-backed RAM plus 256 KB of non-volatile user flash. The flash can store program, configuration, and register data.
Q: Does it require forced-air cooling? A: Yes when ambient temperature exceeds 50 °C (122 °F). A minimum of 70 CFM is required for operation up to 60 °C. Without forced air the limit is 50 °C.
Q: How many serial ports does it have? A: Three: one RS-232 and two RS-485 (one optically isolated). These support SNP Slave protocol and programmer attachment.
Q: Is the Series 90-70 platform still supported? A: No. The platform is obsolete. Remaining IC697CPX928 units are new surplus or refurbished. Long-term projects should plan migration to current Emerson PACSystems platforms.
Q: What battery does it use and how long does memory last? A: Standard IC697ACC701 lithium battery. Shelf life is approximately 5 years at 20 °C; memory retention is about 6 months without applied power. The battery can be hot-swapped.
Q: Why is a new-surplus IC697CPX928 often priced lower than modern CPUs? A: It is an end-of-life Series 90-70 component. New-surplus stock comes from project overstock, is fully tested, and is sold at a reduced price while still carrying warranty. Condition is clearly stated as New Original / New Surplus.
Q: Can I use this CPU with Genius (IC660/IC661) I/O? A: Yes. It supports both IC66* (Genius) I/O and standard IC697 I/O modules.
