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. Product Core Brief
- Model: GE IC697CPX772-HD
- Brand: GE Fanuc / Emerson Automation
- Series: Series 90-70 PLC
- Core Function: Central programmable logic controller CPU
- Product Type: PLC Central Processing Unit
- Key Specs: 96 MHz 80486DX4 core; 512 KB battery-backed RAM; 256 KB Flash
- Condition: New Original / New Surplus
3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | IC697CPX772-HD |
| Manufacturer | GE Fanuc (Emerson Automation) |
| Series | Series 90-70 PLC |
| Module Type | CPU / Central Controller |
| Processor | Intel 80486DX4 @ 96 MHz (32-bit floating) |
| User Memory | 512 KB battery-backed RAM |
| Non-volatile Memory | 256 KB Flash |
| Boolean Execution | ~0.4 µs per instruction |
| Discrete I/O Capacity | Up to 2,048 points |
| Analog I/O Capacity | Up to 8,192 points |
| Communication Ports | 1× RS-232 (RJ11), 2× RS-485 (D-sub) |
| Supported Protocols | SNP / SNPX / RTU serial |
| Backplane Power | ~5 V DC supply |
| Operating Temp | 0 °C to +60 °C (32 °F to 140 °F) |
| LED Indicators | OK, RUN, EN, P1, P2, P3, MEM PROTECT |
| Rack Mounting | Single slot in Series 90-70 rack |
4. Product Introduction
The GE IC697CPX772-HD is a central CPU module for the GE Fanuc Series 90-70 programmable logic controller (PLC) system, delivering deterministic logic processing and broad I/O capacity for industrial automation tasks. With an Intel 80486DX4 processor at 96 MHz, this CPU executes Boolean logic in ~0.4 µs and supports floating-point calculations for complex control functions.
Equipped with 512 KB of battery-backed RAM and 256 KB Flash memory, the IC697CPX772-HD stores programs reliably and retains data during power interruptions. Three serial ports (RS-232 and two RS-485) provide flexible connectivity to engineering stations and field devices. Its capacity to handle up to 2,048 discrete and 8,192 analog I/O points makes it suitable for mid-to-large-scale PLC installations.
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No LEDs after power applied | No +5 V supply from backplane | ✅ High | Measure +5 V DC on CPU slot with multimeter | Verify PSU output and fuse before replacing CPU |
| RUN LED doesn’t latch | CORRUPTED program or memory protect ON | ⚠️ Medium | Check MEM PROTECT switch and battery voltage | Disable protect, replace battery, reload program |
| Serial port comm fails | Wrong baud or wiring | ⚠️ Medium | Verify RS-232/RS-485 cabling & settings | Correct protocol and pinout |
| PLC logic stalls or errors | Memory retention failure | ⚠️ Medium | Verify battery health and RAM retention | Replace battery and retest |
| I/O modules not responding | Faulty backplane or bus | ❌ Low | Check slot continuity and adjacent card errors | Isolate backplane or bus faults |
Ballpark insight: Most faults showing “dead CPU behavior” trace back to power or memory protection issues, not the CPU core itself. Confirm backplane power and LED status codes first before concluding module failure.
- IC697CPX772-HD
6. Frequently Asked Questions (FAQ)
Q1: Is IC697CPX772-HD the same as IC697CPX772?
A: Yes — the “-HD” suffix is a revision/series code within the same base CPU772 family. Core specs remain the same across revisions.
Q2: Can this CPU be used for redundant hot-standby?
A: No. The CPX772 is a standalone Series 90-70 CPU; redundancy models are the CGR772 family, which have dual-bus sync for hot standby.
Q3: What software do I need to program this CPU?
A: Series 90-70 CPUs are typically programmed with legacy GE/Emerson tools like Logic Developer 90-70 or appropriate releases of Proficy Machine Edition that support 90-70. Check firmware compatibility before project upload.
Q4: Why does it have three serial ports?
A: One port (RS-232) is used for programming or HMIs, while the two RS-485 ports can connect field devices or backplanes using SNP serial protocols.
Q5: How much I/O can I drive with this controller?
A: It supports up to 2,048 discrete I/O points and 8,192 analog points when paired with compatible Series 90-70 I/O modules.
Q6: Why is this listed cheaper than current OEM pricing?
A: This CPU is a legacy/obsolete Series 90-70 PLC part and is no longer in production. Inventory on the secondary market is mostly New Surplus or Refurbished/Tested, hence lower pricing.
