Description
Key Technical Specifications
- Manufacturer: ABB
- Model: PM861AK01
- Ordering Information: 3BSE018157R1
- Series: AC 800M
- Function: Processor unit for ABB control systems
- Power Supply: 24 V DC, 19.2 to 30 V DC
- Power Consumption: 210 mA typical, 360 mA max
- Memory: 64 MB total, 51.389 MB application RAM
- Processor: MPC866, 133 MHz
- Redundancy: Supported
- Ethernet Ports: 2 x RJ45
- Serial Ports: 2 x RJ45
- Operating Temperature: 0 to +55 C
- Storage Temperature: -40 to +70 C
- Dimensions: 119 mm x 186 mm x 135 mm
- Weight: 1.2 kg including base
- Protection: IP20
- Compatibility: Use with the correct base plate and AC 800M setup
Product Introduction
ABB PM861AK01 3BSE018157R1 is an AC 800M processor unit kit used in ABB industrial automation systems. It handles controller execution, network communications, and system coordination, and it supports redundancy in the AC 800M platform.
This is a controller spare where the exact part number and base plate matter. Match the ordering code, controller family, and cabinet configuration before buying, because PM861AK01 is not a generic swap-in CPU.
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| CPU does not boot | Missing 24 V DC or failed processor unit | ✅ High | Measure 24 V DC at the controller supply terminals | If power is present and LEDs stay dark, the module is suspect |
| Controller not visible on network | Ethernet cabling or processor fault | ✅ High | Check both RJ45 Ethernet ports and link LEDs | Verify cabling before replacing hardware |
| Redundancy does not transfer | Partner mismatch or controller fault | ✅ High | Check primary/backup status in diagnostics | Confirm redundancy configuration first |
| INIT or fault LED stays on | Config issue or internal error | ✅ High | Read the diagnostic buffer in 800xA | If the fault repeats after restore, replace the unit |
| Serial communication fails | Wrong port use or cable issue | ✅ Medium | Test COM3 and COM4 separately | Recheck pinout and isolation before blaming the CPU |
| Random resets | Power instability or aging hardware | ✅ Medium | Monitor supply voltage under load | Fix the power source before replacing the module |
| Program will not load | Memory or configuration problem | ✅ Medium | Verify the backup image and CompactFlash setup | Restore the configuration or test the storage path |
If you get stuck, send photos of the nameplate, base plate, and diagnostic log to technical support before ordering a replacement.
- PM861AK01
- PM861AK01
Frequently Asked Questions
What is ABB PM861AK01?
It is an ABB AC 800M processor unit kit used in industrial control systems. ABB identifies it as the Processor Unit with order code 3BSE018157R1.
Is 3BSE018157R1 the same as ?
Yes, that is the ordering information tied to this unit. Always confirm the label on the installed controller before purchasing a replacement.
Does it support redundancy?
Yes. The family supports redundancy in the AC 800M platform.
Can I use it without the proper base plate?
No. The AC 800M controller kit is tied to its base plate and related terminators, so do not assume a loose CPU alone will solve the problem.
Is it hot-swappable?
No. Power down the cabinet, verify discharge, and follow lockout/tagout before removal or installation.
Why do sellers list it as new surplus or refurbished?
Because it is a legacy AC 800M controller unit and market stock usually comes from unused spares or recovered inventory rather than current factory production.
What should I check before ordering?
Match the full model, ordering code, base plate, and controller family. In the field, that is the fastest way to avoid a no-boot swap and a long night.
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