Description
Product Introduction & Engineering Value
I’ve seen many Series 90-30 systems remain in production for more than twenty years with very little attention beyond routine maintenance. When one of these systems fails, the priority is usually restoring operation—not redesigning the entire control platform.
The GE IC693CPU323 is a 10-slot embedded Turbo CPU designed for the Series 90-30 PLC family. By integrating the processor into the baseplate, it frees every numbered slot for I/O and specialty modules while providing dependable processing performance for legacy manufacturing equipment and OEM machinery.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | GE Fanuc (Emerson) |
| Model | IC693CPU323 |
| PLC Family | Series 90-30 |
| CPU Type | Embedded Turbo CPU Baseplate |
| Processor | Intel 80188 |
| Processor Speed | 10 MHz |
| User Program Memory | 12 KB (6 KB on firmware prior to Release 7) |
| Register Memory | 1,024 Words |
| Maximum Discrete I/O | 320 Inputs / 320 Outputs (combined system capacity) |
| Typical Scan Rate | 0.6 ms per 1K Boolean logic |
| Timers/Counters | 340 |
| Built-in Communications | One serial port supporting SNP and SNP-X protocols |
| Memory Type | Battery-backed RAM with optional EPROM/EEPROM |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Power Requirement | 430 mA @ +5 VDC |
Field Application & The “Trench” Experience
A beverage bottling facility experienced intermittent production stops after a prolonged power interruption. The embedded CPU completed its power-up sequence, but machine logic failed to execute consistently. Engineers initially suspected corrupted application software, yet diagnostics showed unstable memory retention caused by an aging controller.
Replacing the IC693CPU323 with a compatible unit and restoring the archived PLC program returned the entire packaging line to service within the scheduled maintenance window. Because the processor is integrated into the baseplate, no cabinet modifications or additional CPU hardware were required.
Common applications include:
- High-speed packaging and labeling equipment
- Conveyor sequencing for distribution centers
- Plastic extrusion line control
- Industrial compressor automation
IC693CPU323
IC693CPU323
Transparency SOP: QA & Testing
Every New Surplus and Refurbished IC693CPU323 undergoes a documented validation process before shipment.
- Verify catalog number, firmware revision, and hardware identification.
- Inspect the embedded baseplate, backplane connectors, and PCB assemblies.
- Install the controller in a Series 90-30 test system.
- Load a functional PLC application to verify processor operation and memory integrity.
- Test serial communication, I/O addressing, and power-up diagnostics.
- Confirm battery-backed memory retention after power cycling.
- Package the controller using ESD-safe materials with protective industrial packaging.
The Veteran’s Tech Trap Guide
⚠️ Back Up the PLC Program First
Although battery-backed RAM protects the application, never assume the program is still available. Upload and archive the project before replacing the controller whenever possible.
⚠️ Don’t Confuse Embedded and Modular CPUs
The IC693CPU323 is built into a 10-slot baseplate. It is not interchangeable with plug-in CPU modules such as the IC693CPU331 or IC693CPU341.
PRO TIP: If the PLC repeatedly loses its application after power removal, inspect the power supply battery before replacing the CPU. Weak backup batteries account for many unnecessary controller replacements.
⚠️ Verify Firmware Compatibility
Controllers manufactured before Release 7 provide only 6 KB of user program memory. Larger applications may require a later firmware revision to load successfully. Firmware Release 8.21 also introduced support for additional specialty modules.
Dynamic FAQ
Q1. What is the IC693CPU323 designed for?
It is an embedded CPU for the GE Series 90-30 PLC, combining the processor and a 10-slot baseplate into a single assembly for compact control systems.
Q2. How much user program memory is available?
Controllers with Release 7 or later firmware provide 12 KB of user program memory, while earlier firmware revisions support 6 KB.
Q3. Does the support Ethernet communications?
Yes. Although the CPU includes a built-in serial port, Ethernet, Profibus, Genius, and other industrial networks can be added through compatible Series 90-30 communication modules.
Q4. Can expansion or remote racks be connected?
No. Unlike modular CPU baseplates, the embedded does not include an expansion connector for local or remote racks. Applications requiring rack expansion typically use modular CPU baseplates instead.
Q5. Are New Surplus controllers genuinely unused?
Yes. New Surplus units are unused OEM inventory that has not been installed in an operating system. Each controller is inspected for physical condition, identification labels, and connector integrity before shipment.
Q6. Is the recommended for new automation projects?
The is primarily used to maintain and extend existing Series 90-30 installations. For new control system designs, current-generation PLC platforms generally provide greater processing capacity, enhanced communications, and longer product lifecycle support.
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