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Key Technical Specifications
| Parameter | Value |
|---|---|
| Catalog Number | IC693CPU350-EJ |
| Product Family | GE Fanuc Series 90-30 |
| CPU Type | Single-slot modular CPU |
| Processor | Intel 80386EX |
| Processor Speed | 25 MHz |
| User Program Memory | 48 KB for the EJ revision; verify the installed firmware and memory configuration |
| Typical Logic Execution | 0.22 ms per 1K Boolean logic |
| CPU Baseplates per System | 1 CPU baseplate |
| Additional Baseplates | Up to 7 expansion and/or remote baseplates |
| Discrete Inputs | 2,048%I points |
| Discrete Outputs | 2,048%Q points |
| Discrete Global Memory | 1,280%G bits |
| Internal Coils | 4,096%M bits |
| Temporary Coils | 256%T bits |
| Register Memory | 9,999%R words |
| Analog Inputs | 2,048%AI words |
| Analog Outputs | 512%AQ words |
| System Registers | 28%SR words |
| Timers/Counters | More than 2,000 |
| Backplane Current | 670 mA from +5 VDC |
| Built-In Serial Communication | One serial port through the PLC power supply |
| Serial Protocols | SNP/SNP-X slave |
| Optional Networks | Ethernet, FIP, Profibus, Genius Bus Controller, GCM, and GCM+ through option modules |
| Floating-Point Math | Supported in firmware release 9.0 and later |
| Memory Storage | RAM and Flash |
| Battery-Backed Clock | Yes |
| Operating Temperature | 0–60 °C ambient |
| Firmware Revision | EJ associated with firmware release 10.74 documentation |
The GE Fanuc IC693CPU350-EJ is a single-slot, 25 MHz Series 90-30 CPU module based on the 80386EX processor. The EJ revision supports 48 KB of user program memory, 0.22 ms execution per 1K Boolean logic, and up to eight total baseplates in one system.
It supports up to 2,048 discrete inputs, 2,048 discrete outputs, 2,048 analog input words, and 512 analog output words. The CPU provides SNP/SNP-X slave communication through the power-supply serial port; Ethernet, Genius, Profibus, and other networks require compatible option modules.
IC693CPU350-EJ
IC693CPU350-EJ
IC693CPU350-EJ
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| CPU will not start | Power supply failure, poor seating, backplane fault, or CPU hardware failure | ✅ High | Measure the +5 VDC rail and verify the CPU is fully seated in the baseplate | Check rack power and connector condition before replacing the CPU |
| CPU status LED shows a fault | Program error, memory fault, watchdog timeout, or incompatible configuration | ✅ High | Read the PLC fault table with Logicmaster 90 or compatible software | Save diagnostic data before clearing faults or loading a program |
| Programmer cannot connect | Serial cable, power-supply port, baud settings, or SNP configuration | ✅ High | Test the serial port on the power supply and verify SNP/SNP-X settings | Check the cable and port before condemning the CPU |
| CPU resets intermittently | 5 VDC supply sag, electrical noise, loose backplane, or watchdog event | ✅ Medium | Trend the 5 VDC rail during peak rack loading and review fault history | Correct supply and grounding problems before replacing hardware |
| Program is lost after power removal | Battery failure, memory retention problem, or incorrect backup procedure | ✅ High | Check battery condition and compare the CPU program with a verified backup | Replace the battery using the approved procedure and restore a known-good program |
| CPU does not recognize expansion racks | Cable fault, invalid rack configuration, or system limit exceeded | ✅ High | Verify the CPU model, baseplate count, cable routing, and hardware configuration | Keep the system within one CPU baseplate plus seven expansion or remote bases |
| Ethernet communication does not work | No Ethernet option module or incompatible network module | ✅ High | Inspect the rack for a compatible Ethernet interface and review configuration | Do not expect native Ethernet from the IC693CPU350-EJ alone |
| Floating-point instructions fail | Firmware below the required revision or unsupported program instruction | ✅ High | Check CPU firmware and confirm release 9.0 or later | Upgrade firmware only after confirming application and compatibility requirements |
| Scan time is longer than expected | Large program, communication load, interrupts, or excessive diagnostics | ❌ Low | Monitor scan time and compare it with the 0.22 ms per 1K Boolean reference | Review logic and communications before replacing the CPU |
| Replacement behaves differently from the installed CPU | Firmware, memory, or hardware revision mismatch | ✅ High | Record the old CPU firmware and compare it with the replacement label and diagnostic screen | Match the EJ revision and verify program compatibility before commissioning |
| Battery life is unexpectedly short | EJ revision memory hardware or aging battery | ✅ High | Check battery date, retention behavior, and CPU revision documentation | Keep a verified program backup and replace the battery on a controlled maintenance schedule |
If the fault remains unclear, contact technical support with photos of the CPU label, firmware screen, power supply, status LEDs, rack layout, PLC fault table, battery condition, and communication configuration.
Frequently Asked Questions (FAQ)
What is the IC693CPU350-EJ?
It is a single-slot modular CPU for the GE Fanuc Series 90-30 PLC. The EJ revision uses a 25 MHz 80386EX processor and is associated with Series 90-30 firmware release 10.74 documentation.
How much memory does the EJ revision provide?
The EJ documentation identifies 48 KB of user program memory. Do not assume that every IC693CPU350 listing has the same memory specification; verify the exact suffix, firmware revision, and CPU label before purchase.
How many racks can this CPU control?
The system can contain one CPU baseplate plus up to seven expansion and/or remote baseplates, for eight total baseplates, subject to the installed modules and system configuration.
Does the IC693CPU350-EJ have built-in Ethernet?
No. It provides one serial interface through the PLC power supply for SNP/SNP-X slave communication. Ethernet and other network interfaces require compatible option modules.
Does it support floating-point calculations?
Yes, when the CPU firmware is release 9.0 or later. Confirm the firmware revision on the replacement before using floating-point instructions in the application.
Will my existing Series 90-30 program run on this CPU?
Usually, compatibility depends on program size, firmware revision, memory allocation, instruction usage, and installed option modules. Back up the running program and record the original CPU firmware before swapping the processor.
What is the battery concern with the EJ revision?
An Emerson firmware-release document notes that the EJ hardware revision replaced obsolete cache RAM and reduced expected battery life from approximately six years to ten months at room temperature. Treat the battery as a scheduled maintenance item and maintain a verified offline program backup.
Why is this CPU cheaper than a current factory controller?
The IC693CPU350-EJ is a legacy Series 90-30 processor commonly sourced through surplus, used, or refurbished inventory. Confirm the exact revision, firmware, battery status, test report, warranty, and return terms before purchase.
