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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Processor | 80386EX @ 25 MHz |
| Typical Scan Rate | 0.22 ms per 1K Boolean logic |
| User Memory | 240K bytes (configurable %R/%AI/%AQ) |
| Discrete I/O | 2,048 %I / 2,048 %Q |
| Analog | Configurable %AI / %AQ up to 32,640 words |
| Baseplates Supported | 8 (1 CPU + 7 expansion/remote) |
| Power Draw | 890 mA @ +5 VDC |
| Built-in Ports | 3 (Port 1 RS-232, Port 2 RS-485, + RS-485 on power supply) |
| Protocols | SNP/SNPX, RTU slave, Serial I/O (Ports 1 & 2) |
| Memory Type | RAM + Flash |
| Floating Point | Yes (firmware Release 9.0 and later) |
| Operating Temp | 0 to 60 °C (32 to 140 °F) |
| Battery-Backed Clock | Yes |
| Weight | Approx. 0.45 kg (1.00 lb) |
4. Product Introduction
The GE Fanuc IC693CPU363 is a single-slot high-performance CPU module for the Series 90-30 PLC platform. It runs an 80386EX processor at 25 MHz, delivers a 0.22 ms/K Boolean scan rate, and provides 240K of configurable user memory. The module supports up to eight baseplates and 4,096 discrete I/O points, making it a direct fit for mid-to-large Series 90-30 systems still running in plants worldwide.
Its three built-in serial ports (RS-232 + RS-485 on the CPU faceplate plus the power-supply port) handle SNP/SNPX and RTU without requiring extra communication modules for basic serial work. Floating-point math support (firmware 9.0+) and flash memory storage keep it practical for legacy process and discrete control applications where RX3i migration is not yet scheduled.
IC693CPU363
IC693CPU363
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No LEDs on power-up | Backplane or PSU failure | ❌ Low | Measure +5 VDC at power supply terminals; verify >4.75 V under load | Replace or test PSU and backplane before swapping CPU |
| RUN LED off or flashing, CPU stays in STOP | Keyswitch position, fault table, or program loss | ✅ High | Confirm keyswitch in RUN; connect programmer and clear Controller + I/O fault tables | Clear faults, reload program from backup; check battery voltage |
| BATTERY LED on or program lost after power cycle | Weak or dead backup battery | ✅ Medium | Measure battery voltage (IC693ACC301); replace if <3.0 V | Install fresh battery, restore program, write to flash |
| Serial ports fail to communicate | Port config mismatch or cable issue | ✅ High | Verify SNP/RTU settings in hardware config; test with known-good cable on Port 1 or 2 | Match baud rate, parity, and station address exactly; avoid mixing master/slave incorrectly |
| Watchdog timeout or fatal fault on power-up | Corrupted flash or oversized config | ✅ High | Read fault table in Proficy Machine Edition / Logic Developer | Clear memory, reload known-good folder, write to flash |
| I/O points unresponsive while CPU runs | Local I/O module or expansion cable fault | ❌ Low | Check status LEDs on I/O modules and expansion cables | Isolate by swapping adjacent I/O cards or cables first |
If the fault table shows hardware-related codes after the above checks, contact technical support with clear photos of the module faceplate, LED states, and a diagnostic log export.
6. Frequently Asked Questions (FAQ)
Q: Is the IC693CPU363 still supported or is it obsolete? A: The Series 90-30 platform is mature and no longer in active production. Emerson still provides limited technical documentation and repair options, but new factory stock is gone. Units available today are New Surplus or carefully tested refurbished. Plan for eventual migration to RX3i if the system is critical.
Q: Can I hot-swap this CPU? A: No. Power down the entire rack before removing or inserting the module. Hot-swapping risks backplane damage and can corrupt the program or configuration.
Q: Will my existing program and hardware configuration transfer directly? A: Yes, provided the firmware revision is compatible and the memory configuration (%R, %AI, %AQ sizes) matches. Always document the current firmware version and take a full backup before the swap. Firmware 9.0 or later is required for floating-point math and full 240K memory use.
Q: What is the difference between this and the CPU360 or CPU364? A: The CPU363 adds two front-panel serial ports (RS-232 and RS-485) compared with the single-port CPU360. The CPU364 includes an embedded Ethernet interface. All three share the same 25 MHz processor and 240K memory architecture.
Q: Do I need to reconfigure DIP switches or jumpers? A: The IC693CPU363 has no user DIP switches for node address or baud rate—those settings live in the hardware configuration stored in the CPU. Still photograph the old module faceplate and note the keyswitch position before removal so you can match the physical state exactly.
Q: Why is New Surplus priced lower than a factory-new unit would have been? A: These are unused original modules from OEM or distributor surplus inventory. They have never been installed in a running system. Each unit undergoes inbound visual inspection, power-on testing on a genuine Series 90-30 rack, serial port verification, and a multi-hour load run before shipping. Full test documentation is available on request.
Q: What warranty and return policy apply? A: Standard coverage is 1 year on functional operation when installed according to GE Fanuc documentation. Test reports and photos are retained for every unit. If a problem appears within the warranty window, return it with the original packaging and diagnostic details for evaluation.
