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Key Technical Specifications
| Parameter | Value |
|---|---|
| Catalog Number | IC693CPU352-EK |
| Product Family | GE Fanuc Series 90-30 |
| CPU Type | Single-slot modular CPU |
| Processor | Intel 80386EX |
| Processor Speed | 25 MHz |
| User Program Memory | Up to 240 KB with firmware release 9.0 and later |
| Pre-Release 9.0 Memory | 80 KB fixed memory |
| Typical Logic Execution | 0.22 ms per 1K Boolean logic |
| CPU Baseplates per System | 1 |
| Additional Baseplates | Up to 7 expansion and/or remote baseplates |
| Discrete Inputs | 2,048%I points |
| Discrete Outputs | 2,048%Q points |
| Global Memory | 1,280%G bits |
| Internal Coils | 4,096%M bits |
| Temporary Coils | 256%T bits |
| System Status References | 128%S bits |
| Register Memory | Configurable up to 16,384 words with Logicmaster; higher limits may apply with later Control software |
| Analog Input Memory | Configurable %AI word memory |
| Analog Output Memory | Configurable %AQ word memory |
| Timers/Counters | More than 2,000 |
| Built-In Serial Ports | Three ports |
| Serial Protocols | SNP/SNP-X slave, RTU slave, SNP/SNP-X master/slave, and Serial I/O |
| Floating-Point Math | Hardware-supported |
| Battery-Backed Clock | Yes |
| Memory Storage | RAM and Flash |
| Backplane Current | 890 mA from +5 VDC |
| Operating Temperature | 0–60 °C ambient |
| Programming Software | Logicmaster 90-30/20/Micro Release 7.00 or later; Control Release 2.0 or later |
| EK Revision Purpose | Hardware correction for a fatal fault that could occur when powering up from Flash |
The GE Fanuc IC693CPU352-EK is a single-slot, 25 MHz Series 90-30 CPU using an 80386EX processor. With firmware release 9.0 and later, it provides up to 240 KB of configurable user memory, 0.22 ms execution per 1K Boolean logic, and hardware-based floating-point math.
The CPU supports one CPU baseplate plus up to seven expansion or remote baseplates and provides three serial ports for SNP/SNP-X, RTU slave, and Serial I/O functions. The EK revision incorporates a hardware change addressing a fatal fault that could occur during power-up from Flash memory.
IC693CPU352-EK
IC693CPU352-EK
IC693CPU352-EK
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| CPU will not start | Power supply failure, backplane fault, poor seating, 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 |
| Fatal fault occurs during power-up | Earlier hardware revision or corrupted Flash image | ✅ High | Review the fault table and confirm the CPU suffix is EK; inspect Flash-based startup behavior | Use the correct EK revision and reload a verified program if required |
| Programmer cannot connect | Serial cable, power-supply port, baud setting, or SNP configuration | ✅ High | Test each serial port and verify SNP/SNP-X settings in the programming software | Check cable and port configuration before condemning the CPU |
| RTU slave device will not communicate | Wrong port, protocol setting, or unsupported RTU master arrangement | ✅ High | Verify the selected port, baud rate, parity, station address, and RTU mode | Correct the serial configuration; RTU master operation may require a PCM module |
| CPU resets intermittently | 5 VDC supply sag, electrical noise, watchdog timeout, or backplane connection | ✅ Medium | Trend the 5 VDC rail and review the PLC fault history during the reset | Correct power and grounding problems before replacing the CPU |
| Program memory appears smaller than expected | Firmware below release 9.0 or memory allocation to %R, %AI, and %AQ | ✅ High | Check firmware revision and review configurable word-memory allocation | Confirm available user memory before migrating the application |
| Floating-point instructions fail | Incorrect firmware, unsupported instruction, or program configuration issue | ✅ Medium | Confirm firmware release and test a controlled floating-point operation offline | Verify firmware and instruction support before changing hardware |
| Expansion rack is not recognized | Cable fault, invalid configuration, or system rack 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 | Missing Ethernet option module or incompatible network hardware | ✅ High | Inspect the rack for a compatible Ethernet interface and review network configuration | Do not expect native Ethernet from the CPU352 alone |
| CPU loses its program after power removal | Battery failure, memory-retention fault, or improper replacement procedure | ✅ High | Check battery condition and compare the stored program with a verified backup | Replace the battery under controlled conditions and maintain an offline backup |
| Scan time exceeds expectations | 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 |
If the fault remains unclear, contact technical support with photos of the CPU label, EK revision marking, firmware screen, power supply, status LEDs, battery, PLC fault table, and serial/network configuration.
Frequently Asked Questions (FAQ)
What is the GE Fanuc IC693CPU352-EK?
It is a single-slot modular CPU for the GE Fanuc Series 90-30 PLC. The EK suffix identifies a hardware revision associated with a correction for a fatal power-up fault involving Flash memory.
How much user memory does this CPU provide?
With firmware release 9.0 and later, the CPU352 supports up to 240 KB of configurable user memory. The actual program space depends on how much memory is allocated to %R, %AI, and %AQ word tables.
How many racks can the IC693CPU352-EK control?
The system can contain one CPU baseplate plus up to seven expansion and/or remote baseplates. The actual rack design must also satisfy power, cable, module, and configuration limits.
Does the CPU352 support floating-point math?
Yes. The CPU352 includes hardware-based floating-point math support. Confirm the firmware and programming software versions before migrating an application that uses floating-point instructions.
How many serial ports are built in?
The Series 90-30 documentation identifies three serial ports: the SNP/SNP-X interface on the power-supply connector and Ports 1 and 2 for additional serial functions. Supported protocols depend on the configured port and installed hardware.
Does it have built-in Ethernet?
No. Ethernet requires a compatible Series 90-30 Ethernet interface or option module. The CPU’s built-in serial functions should not be described as native Ethernet capability.
Can I replace an IC693CPU350 with an IC693CPU352-EK?
A substitution may require program, memory, firmware, rack, and communication review. The CPU352 offers substantially larger memory and floating-point capability, but verify application compatibility, option modules, serial configuration, and register allocation before changing processors.
What should I verify when buying an EJ or EK CPU?
Confirm the complete suffix, firmware revision, Flash and RAM status, battery condition, hardware revision, test report, warranty, and return policy. Do not accept a generic IC693CPU352 listing when the installation specifically requires the EK revision.
