Description
Product Introduction & Engineering Value
Small PLC systems often remain in service for decades because they continue to perform exactly as required. The challenge comes when a failed CPU must be replaced without changing the application program or cabinet layout.
The GE IC693CPU311-AC is an embedded CPU for the Series 90-30 family. It combines the processor and a 5-slot baseplate into a single assembly, making it well suited for compact machine control, OEM equipment, and legacy automation systems where maintaining hardware compatibility is more important than adding new features. Firmware revision 8.21 introduced support for additional specialty modules while maintaining backward compatibility with earlier CPU311 hardware revisions.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | GE Fanuc (Emerson) |
| Model | IC693CPU311-AC |
| PLC Family | Series 90-30 |
| CPU Type | Embedded CPU with 5-slot baseplate |
| Processor | Intel 80188 |
| Processor Speed | 10 MHz |
| User Program Memory | 6 KB |
| Register Memory | 512 Words |
| Maximum Discrete I/O | 160 Inputs / 160 Outputs |
| Analog Register Capacity | 64 AI Words / 32 AQ Words |
| Timers/Counters | 170 |
| Built-in Communications | One serial port (via power supply connector), SNP/SNP-X support |
| Power Requirement | 410 mA @ +5 VDC |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Typical Scan Time | Approximately 18 ms per 1K Boolean logic |
Field Application & The “Trench” Experience
An OEM conveyor system installed in the late 1990s suddenly stopped booting after a prolonged power outage. Maintenance initially suspected corrupted application memory, but diagnostics showed the embedded CPU had failed. Since the machine’s control cabinet had very limited space, replacing the system with a newer PLC would have required extensive rewiring and software conversion.
Installing an IC693CPU311-AC restored the original controller architecture. After loading the archived application and verifying the I/O configuration, production resumed during the same maintenance shift without modifying field wiring.
Typical applications include:
- Packaging machine sequence control
- Small wastewater lift station automation
- Industrial compressor control panels
IC693CPU311-AC
IC693CPU311-AC
Transparency SOP: QA & Testing
Before shipment, each module follows a documented inspection procedure:
- Verify the complete catalog number and firmware revision.
- Inspect the embedded baseplate, CPU board, connectors, and memory components.
- Install the unit in a compatible Series 90-30 test system.
- Confirm successful power-up, CPU diagnostics, and communication with programming software.
- Load and execute a functional PLC test program to verify memory retention, I/O response, and serial communication.
- Package the module in ESD-safe materials with protective cushioning.
For New Surplus inventory, factory identification labels and unused condition are verified. Refurbished units undergo additional operational testing and memory backup verification before shipment.
The Veteran’s Tech Trap Guide
⚠️ Verify the Firmware Revision
The IC693CPU311-AC ships with Firmware Release 8.21. Some specialty modules require this firmware or later, while earlier CPU311 revisions may not recognize newer hardware. Always compare firmware before replacing the CPU.
⚠️ Check Battery Condition Before Power Removal
Program retention depends on a healthy backup battery. Replacing the CPU without checking battery status can result in unnecessary program loss if the application has not been archived.
PRO TIP: Before condemning the CPU, inspect the power supply. Many Series 90-30 startup failures are caused by unstable +5 VDC output rather than a defective processor.
⚠️ Confirm Embedded Baseplate Compatibility
Unlike modular CPUs, the IC693CPU311-AC is integrated into a 5-slot baseplate. It cannot simply be swapped into a standard expansion rack, so verify the original hardware configuration before ordering.
Dynamic FAQ
Q1. What type of PLC is the IC693CPU311-AC designed for?
It is an embedded CPU for the GE Series 90-30 PLC platform, combining the processor and a 5-slot baseplate into a single assembly.
Q2. What distinguishes the “-AC” revision?
The -AC revision includes Firmware Release 8.21, replacing earlier -AB and previous revisions while adding support for newer Series 90-30 specialty modules.
Q3. How much application memory is available?
The CPU provides 6 KB of user program memory, making it suitable for compact machine control and small to medium automation tasks.
Q4. Can the firmware be upgraded?
Yes. GE provided EPROM-based firmware upgrade kits for supported hardware revisions. Always verify board revision compatibility before performing an upgrade.
Q5. Are New Surplus units genuinely unused?
Yes. New Surplus inventory consists of unused OEM stock that has never been commissioned in an operating system. Each unit is inspected for physical condition, identification labels, and connector integrity before shipment.
Q6. Is the suitable for new automation projects?
While it remains an excellent replacement for existing Series 90-30 installations, it is generally selected for maintaining legacy systems rather than designing new control platforms. For modernization projects, evaluating current-generation PLC hardware may provide greater processing capacity and long-term product availability.
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