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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Processor | 1 GHz Celeron-M |
| User Memory (RAM) | Up to 64 MB battery-backed |
| Non-volatile Flash | 64 MB |
| Boolean Execution Speed | 0.047 ms per 1000 Boolean instructions |
| Discrete I/O | 32K bits (%I / %Q) |
| Analog I/O | Configurable up to 32K words (%AI / %AQ) |
| Embedded Ports | 1× RS-232 + 1× RS-485 |
| Supported Serial Protocols | Modbus RTU Slave, SNP, Serial I/O |
| Power Requirements | +3.3 VDC: 1.0 A nominal; +5 VDC: 1.2 A nominal |
| Operating Temperature | 0 to 60 °C (32 to 140 °F) |
| Backplane | Dual: RX3i PCI + 90-30-style serial |
| Program Blocks | Up to 512 (max 128 KB each) |
| Floating Point | Yes |
4. Product Introduction
The IC695CPU320 is a GE Fanuc / Emerson PACSystems RX3i CPU module designed for real-time control of machines, processes, and material-handling systems. It sits in a universal RX3i backplane and communicates with I/O over the high-speed PCI bus while retaining serial-bus compatibility for existing Series 90-30 modules.
With 64 MB of battery-backed RAM, 64 MB of flash, and a 1 GHz processor delivering 0.047 ms per 1000 Boolean instructions, this CPU handles large programs and high I/O counts without the need for an embedded Ethernet port (add an IC695ETM001 if network connectivity is required). It remains a direct drop-in for systems originally built around the CPU320 platform.
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No LEDs on power-up | Backplane power missing or dead CPU | ✅ High | Measure +3.3 V and +5 V at the backplane connector with a multimeter | Verify rack power supply and fuses first; if voltages are present and LEDs stay dark, replace CPU |
| CPU OK LED off / SYSTEM FAULT on | Hardware fault or severe configuration error | ✅ High | Check diagnostic buffer in PAC Machine Edition; note any fault codes | Clear faults if possible; persistent hardware faults usually require module replacement |
| Serial ports unresponsive | Cable, baud rate, or protocol mismatch | ⚠️ Medium | Verify cable pinout and COM port settings against the old module; test with known-good cable | Mirror exact serial parameters from the previous CPU; do not assume factory defaults |
| Program will not retain after power cycle | Battery missing or depleted | ✅ High | Confirm IC693ACC302 / IC695ACC302 battery is installed and within date | Install a fresh compatible auxiliary battery; note that IC698ACC701 is not compatible |
| Scan time unexpectedly high | Oversized logic or heavy communication load | ⚠️ Medium | Monitor sweep time and task status in programmer software | Optimize logic or add Ethernet module if heavy network traffic is present; CPU itself rarely the root cause |
| I/O modules not recognized | Backplane communication failure | ❌ Low | Check status LEDs on adjacent I/O modules and reseat the CPU | Issue is more often an I/O module, power, or backplane problem than the CPU |
If you are still stuck after these checks, send clear photos of the LED pattern, the diagnostic buffer export, and the serial number/firmware revision. We can walk through the next steps.
IC695CPU320
IC695CPU320
IC695CPU320
6. Frequently Asked Questions (FAQ)
Q: Is the IC695CPU320 still in production or is it obsolete? A: It is a mature product with limited remaining stock. Emerson recommends the IC695CPE330 as the functional replacement for new designs. We stock new-surplus units that have been fully tested and carry a 1-year warranty.
Q: Does this CPU have built-in Ethernet? A: No. The IC695CPU320 has only the two serial ports (RS-232 and RS-485). You need an IC695ETM001 Ethernet module (or equivalent) for Ethernet/PROFINET connectivity. The later CPE330 has embedded Ethernet.
Q: Can I hot-swap the IC695CPU320? A: No. Power the rack down before removing or inserting the module. Hot-swapping can damage the backplane or the CPU.
Q: Will my existing program and configuration transfer without changes? A: In most cases yes, provided the firmware revision is compatible and memory allocation stays within the 64 MB limit. Always back up the original project and note the exact firmware version before the swap. Some very old projects may need a minor hardware configuration update in PAC Machine Edition.
Q: What battery does it use and how long does memory retention last? A: Use the IC693ACC302 or IC695ACC302 auxiliary battery module. Retention is typically around 30 days at 20 °C. The IC698ACC701 lithium pack is not compatible and must not be used.
Q: Why is a new-surplus unit priced lower than a factory-new CPE330? A: The CPU320 is end-of-life. New-surplus stock comes from overstock or project cancellations, is tested to original specifications, and is sold at a lower price point while still carrying a full warranty. Condition is clearly stated as New Original / New Surplus.
Q: What is the exact power draw I should plan for? A: Nominal 1.0 A at +3.3 VDC and 1.2 A at +5 VDC. Always leave at least a 20 % margin on the rack power supply when calculating total load.
