Description
Product Introduction
The IC695CPU320 is a PACSystems RX3i CPU module from GE Fanuc, now under Emerson Automation. It serves as the main processor in RX3i racks for real-time control of machines, processes, and material handling systems. This two-slot module handles logic execution, I/O management, and communications across industrial networks.
In our field experience, the 1 GHz Celeron M processor with 64 MB user memory gives it solid headroom compared to earlier RX3i models like the CPU310. It handles larger programs and faster scan times without choking. One thing to watch out for is proper firmware matching when pulling it into legacy racks.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Processor | Intel Celeron M, 1 GHz |
| User Memory (RAM) | 64 MB battery-backed |
| Flash Memory | 64 MB |
| Rack Slots | 2 slots |
| Serial Ports | 1x RS-232 + 1x RS-485 |
| Ethernet | Via separate RX3i modules |
| Logic Execution | Supports floating point, UDTs |
| Operating Temperature | 0°C to 60°C |
| Power Requirements | 3.3V and 5V from backplane |
| Firmware Compatibility | Check latest revision per manual |
Application Scenarios & The “Trench” Experience
We were out at a Midwest chemical plant at 2 AM when a legacy RX3i CPU finally died after 12 years. The whole line went dark. No spares on site. Downtime was costing them thousands per hour. Swapped in a tested IC695CPU320 and had them back online in under 90 minutes. That kind of pressure never leaves you.
- Chemical Processing – Batch reactor control – Needs the 64 MB memory for complex PID loops and recipe management that slower CPUs can’t handle reliably.
- Automotive Assembly – Material handling and robotics coordination – The 1 GHz speed keeps scan times tight during high-speed conveyor synchronization.
- Power Generation – Auxiliary system monitoring – Dual serial ports let it talk Modbus RTU to older instruments while bridging to newer Ethernet networks.
- Food & Beverage – Packaging line sequencing – Handles large programs with floating-point math for precise timing without dropping packets.
In one case, a refinery replaced failing older CPUs during a tight turnaround. The IC695CPU320 dropped right in after we verified the backplane and firmware. Saved them a full day of extended outage. Relief on the operator’s face said it all.
- IC695CPU320
- IC695CPU320
Transparency SOP: Quality Assurance & Testing
We don’t just ship boxes; we test them on actual RX3i racks.
- Inbound Inspection – Check for OEM seals, look for counterfeit marks, verify part number and revision.
- Live Rig Testing – Power-on self-test, full logic scan cycles, communication handshakes with I/O modules.
- Electrical Parameter Checks – Verify backplane voltages and current draw.
- Firmware Verification – Log exact firmware revision and test compatibility.
- Final QC & Anti-static Packaging – Visual inspection, burn-in period, sealed in ESD bags with desiccant.
Every unit goes through this before it leaves.
The Veteran’s Tech Trap Guide
⚠️ Firmware revision mismatches will bite you. Don’t assume the CPU you pull out matches the new one. Load the exact firmware version the plant runs before you go live. We’ve seen comm faults from one revision off.
❗ Take a photo of every DIP switch and jumper setting on the old card. RX3i backplanes can be picky. Missing a setting means the CPU won’t boot right. Trust me on this one.
⚠️ ESD will destroy these modules. Always use a grounded wrist strap and work on a static mat. One zap and that Celeron processor is toast.
One thing to watch out for is multi-drop serial issues. If your setup uses RS-485 on Comm2, power cycling one CPU while others are talking can drop communications. Plan your shutdowns carefully.
Frequently Asked Questions
Is the IC695CPU320 hot-swappable? No. Pulling this live will usually fault the rack or damage the backplane. Always power down the rack for CPU swaps.
Does it support the latest firmware? It runs up to certain revisions depending on hardware date code. Verify exact compatibility with Emerson’s release notes before flashing. Older units may need specific upgrade kits.
Why is this surplus unit cheaper than direct from Emerson? We source globally from decommissioned plants and excess OEM inventory. Every unit is tested — not new production, but functionally solid with 12-month warranty.
Will this work as a direct replacement for older RX3i CPUs? Usually yes, but check memory requirements and I/O configuration. Larger programs may need the extra RAM this model provides.
How do I handle legacy serial communications? Restrict to 57K or lower under heavy load to avoid issues. Use the proper cables like IC693CBL316 for RS-232.
Is this a genuine Emerson/GE module? Yes. We verify OEM markings and test on real RX3i hardware. No counterfeits — we reject those during inbound inspection.
What if my application needs redundancy? This is a standard CPU. Look at the CRU320 series for redundancy requirements.
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