Description
Product Introduction & Engineering Value
Some automation platforms remain in service for decades because replacing a proven control strategy often costs far more than maintaining it. The GE IC697CPU771 has earned that reputation, providing dependable control for thousands of Series 90-70 installations worldwide.
The CPU occupies a single slot in the PLC rack and supports expandable memory, intelligent communication modules, distributed I/O, and high-speed program execution. It remains a practical replacement choice for facilities that continue to rely on mature Series 90-70 infrastructure while extending equipment life.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | GE Fanuc / Emerson |
| Model | IC697CPU771 |
| Product Family | Series 90-70 |
| CPU Type | Expandable Central Processing Unit |
| Processor | 12 MHz Intel 80C186 |
| Execution Speed | Approximately 0.4 µs per Boolean Function |
| Rack Position | Slot 1 Only |
| Maximum Discrete I/O | 2,000 Points (Any Mix) |
| Maximum Analog I/O | Up to 8,000 Points |
| Expansion Memory | 64 KB, 128 KB, 256 KB, or 512 KB CMOS Daughterboard |
| Serial Interface | One RS-422/RS-485 Compatible Programming Port |
| Clock | Battery-Backed Real-Time Calendar Clock |
| Configuration | Software Configurable (No Jumpers or DIP Switches) |
| Backplane | VME C.1 Standard Architecture |
| Battery | IC697ACC701 Lithium Battery |
Field Application & The “Trench” Experience
A paper mill had operated the same Series 90-70 PLC for nearly twenty years. When the original CPU began reporting intermittent battery alarms, engineers considered replacing the entire control system. After evaluating the shutdown costs, they instead installed a replacement IC697CPU771 and retained the existing I/O racks, operator interface, and communication modules.
The upgrade required only program restoration and battery replacement. Production resumed within a scheduled maintenance window, avoiding weeks of engineering work and field rewiring.
Typical applications include:
- Continuous paper machine sequence control
- Steel rolling mill automation
- Bulk material conveying systems
- Municipal water treatment process control
- Chemical batching and reactor sequencing
Transparency SOP: QA & Testing
Every New Surplus and professionally refurbished IC697CPU771 follows a documented inspection and verification procedure before shipment.
- Complete visual inspection of PCB, connectors, and CPU housing.
- Installation in a Series 90-70 CPU rack for power-up verification.
- Processor diagnostics and memory integrity testing.
- RS-422 programming port communication verification.
- Battery-backed clock and CMOS memory retention testing.
- Expansion memory interface verification using compatible daughterboards.
- Extended operational burn-in under simulated PLC loads.
- Final ESD-safe packaging with serial number traceability.
IC697CPU771
The Veteran’s Tech Trap Guide
⚠️ Don’t Forget the Expansion Memory Board
The IC697CPU771 uses a plug-in CMOS memory daughterboard. If the original memory board is not transferred—or a compatible replacement is not installed—the CPU cannot retain the application program.
⚠️ Always Replace the Battery Before Removing the Old One
GE specifically recommends installing the new IC697ACC701 battery before disconnecting the old battery whenever possible. This helps preserve CMOS memory during maintenance.
PRO TIP:
Many engineers immediately suspect CPU failure when the PLC refuses to enter RUN mode. In practice, corrupted memory, an exhausted battery, or incompatible firmware revisions are encountered more frequently than actual processor hardware failures.
⚠️ Install Only in Slot 1
The IC697CPU771 is designed exclusively for Slot 1 of the Series 90-70 CPU rack. Installing it elsewhere will prevent normal system operation.
Dynamic FAQ
Q1. What processor does the use?
The module uses a 12 MHz Intel 80C186 microprocessor, providing approximately 0.4 microseconds per Boolean instruction for Series 90-70 control applications.
Q2. How much memory can the CPU support?
The CPU accepts optional battery-backed CMOS expansion memory modules ranging from 64 KB to 512 KB, allowing the application to be sized according to system requirements.
Q3. Which communication port is built into the CPU?
The includes one RS-422/RS-485 compatible serial programming port used for PLC programming and diagnostics through compatible GE programming software.
Q4. Is New Surplus inventory genuine?
Yes. New Surplus units are genuine OEM inventory that has never been installed in production equipment. Every module undergoes identification verification, visual inspection, and packaging review before shipment.
Q5. How are refurbished modules tested?
Each refurbished CPU undergoes processor diagnostics, memory verification, serial communication testing, battery retention checks, expansion memory interface testing, and extended operational burn-in before release.
Q6. Which I/O families are supported by the ?
The CPU supports Series 90-70 discrete and analog I/O, IC660/IC661 Genius I/O, LAN interface modules, coprocessor modules, and other compatible intelligent option modules through the Series 90-70 VME backplane.
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