Description
Key Technical Specifications
| Parameter | Value |
|---|---|
| Manufacturer | ABB |
| Model | PM864AK01 |
| Order Number | 3BSE018161R1 |
| Product Type | CPU Processor Module |
| Controller Family | AC 800M |
| Processor | 32-bit RISC Processor |
| Memory | 32 MB RAM |
| Flash Memory | 256 MB |
| Power Supply | 24 V DC (19.2–30 V DC) |
| Power Consumption | Approx. 3.5 W |
| Ethernet Ports | 2 × RJ45 10/100 Mbps |
| Serial Ports | RS-232 (COM3), Isolated RS-485 (COM4) |
| Redundancy | CPU Hardware Redundancy Supported |
| Operating Temperature | 0 °C to +55 °C |
| Storage Temperature | -25 °C to +70 °C |
| Protection Rating | IP20 |
| Weight | Approx. 0.7 kg |
| Dimensions | 40 × 125 × 130 mm |
Technical specifications compiled from published product documentation and distributor technical references.
Product Introduction
The ABB PM864AK01 (3BSE018161R1) is a high-performance CPU processor module for the AC 800M controller platform used in ABB System 800xA distributed control systems. It executes application programs, manages process communications, and coordinates field I/O for continuous industrial processes.
Its built-in CPU redundancy support, dual Ethernet interfaces, and industrial-grade reliability make it a common choice for power generation, oil & gas, chemical processing, water treatment, and manufacturing facilities where controller availability is critical. The module integrates easily with ABB S800 I/O and supports scalable control architectures.
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No LEDs after power-up | Missing 24 V DC supply | ❌ Low | Measure 24 V DC at controller power input using a multimeter | Check power supply before replacing CPU |
| CPU RUN LED remains OFF | Boot failure or hardware fault | ✅ High | Observe LED sequence and review controller diagnostics | CPU replacement may be required |
| Communication timeout | Ethernet network fault or firmware mismatch | ⚠️ Medium | Ping controller, verify IP configuration and firmware version | Verify network before replacing module |
| Controller enters Standby unexpectedly | Redundancy synchronization issue | ✅ High | Check redundancy link status and event logs | Inspect redundant CPU pair |
| Unable to download application | Firmware incompatibility | ⚠️ Medium | Compare firmware revisions in Control Builder | Update or match firmware versions |
| Field I/O offline | ModuleBus or communication failure | ❌ Low | Check ModuleBus LEDs and adjacent I/O modules | Verify I/O modules and cables first |
| Frequent watchdog resets | Internal CPU fault or unstable power | ✅ High | Review event buffer and measure supply voltage | Replace only after eliminating power issues |
Technical Note: In practice, PM864AK01 CPUs fail far less frequently than power supplies, communication hardware, or field wiring. Before replacing the processor, collect controller diagnostics, event logs, LED status photos, and network information. Providing these details to technical support often avoids unnecessary hardware replacement.
- PM864AK01 3BSE018161R1
- PM864AK01 3BSE018161R1
Frequently Asked Questions (FAQ)
Q1. Can I hot-swap the PM864AK01 CPU?
Generally, no. Unless your specific redundant system and maintenance procedure explicitly support controlled replacement, power down the controller before removing the CPU. Pulling a processor under load can interrupt communications or damage the backplane.
Q2. Is still available?
Yes, but primarily through industrial automation inventory suppliers. Most units on today’s market are New Original (New Surplus) or professionally tested surplus inventory rather than newly manufactured products. Availability varies by region.
Q3. Does this CPU support redundancy?
Yes. supports ABB AC 800M CPU redundancy, including redundant communication interfaces and redundant S800 I/O architectures for high-availability process control systems.
Q4. Will my application program remain after replacing the CPU?
Not automatically. Always back up the controller application, firmware information, and hardware configuration before replacement. Restore the project using ABB Control Builder after installation if required.
Q5. Why is New Surplus less expensive than ordering directly from the factory?
New Surplus inventory usually comes from unused project stock, canceled installations, or excess warehouse inventory. The hardware has never entered service but is no longer supplied directly through standard OEM channels, reducing procurement cost while maintaining original manufacturing quality.
Q6. What should I verify before installing the replacement CPU?
This is where most commissioning delays happen.
- Document the existing firmware revision.
- Photograph every DIP switch and jumper before removal.
- Verify Ethernet settings and controller node configuration.
- Confirm compatibility with your installed 800xA software version.
- Check total rack power capacity and leave approximately a 20% margin.
I’ve seen maintenance teams lose an entire shift because a replacement CPU shipped with a different firmware revision. Everything looked identical until the controller refused to synchronize with the redundant partner. Recording the original firmware before shutdown can save hours of troubleshooting.
Q7. How is each unit inspected before shipment?
Typical quality control includes:
- OEM label and serial number verification
- Visual inspection for corrosion, rework marks, connector damage, and UV discoloration
- Power-up testing on an AC 800M test rack
- Ethernet and serial communication verification
- CPU diagnostics and memory testing
- Firmware identification and documentation
- ESD-safe packaging with anti-static protection
- Final QC inspection before shipment
Test photos and functional test reports should be available upon request from the supplier.
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