Description
Key Technical Specifications
- Manufacturer: ABB
- Model: PM856K01
- Ordering Information: 3BSE018104R1
- Series: AC 800M
- Function: Processor module for ABB control systems
- Power Supply: 24 V DC
- Redundancy: Supported
- Ethernet Ports: 2x RJ45 for Control Network
- Serial Ports: 2x RJ45, including one isolated configuration port
- Mounting: DIN rail, slide-and-lock base plate system
- Programming: 800xA Control Builder
- Protection: IP20
- Compatibility: Use with the correct TP830 base plate and AC 800M setup
Product Introduction
ABB PM856K01 is an AC 800M processor module kit used in ABB industrial control systems. It sits in the controller family that handles execution, communications, and system coordination, and the platform supports redundancy and standard ABB 800xA configuration workflows.
This is a practical spare for ABB automation sites that need a direct controller replacement or a standby unit. Match the part number, base plate, and system version before ordering, because PM856K01 sits in a hardware family where the kit and the CPU are tied together.
- PM856K01
- PM856K01
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 module | ✅ High | Measure 24 V DC at the controller supply terminals | If power is present and LEDs stay dark, suspect the module |
| Controller not visible on network | Ethernet cabling or processor fault | ✅ High | Check both RJ45 ports and link LEDs | Verify network wiring before replacing hardware |
| Redundancy does not transfer | Mismatch between partner controller settings | ✅ High | Compare primary/backup status and controller diagnostics | Check configuration and pairing before blaming the CPU |
| INIT or fault LED stays on | Corrupt configuration or hardware error | ✅ High | Read the diagnostic buffer in 800xA | If the error returns after config restore, replace the unit |
| Serial port communication fails | Wrong port use or cable issue | ✅ Medium | Test COM3 and COM4 separately | Recheck isolation and cable pinout first |
| Random resets | Power instability or aging hardware | ✅ Medium | Monitor supply voltage under load | Fix the supply problem before replacing the processor |
| Program not loading | Memory or CompactFlash issue | ✅ Medium | Confirm memory media and controller setup | Replace the storage media or verify the restore image |
If you get stuck, send photos of the nameplate, base plate, and diagnostic log to technical support before ordering a replacement.
Frequently Asked Questions
What is ABB PM856K01?
It is an ABB AC 800M processor module kit used as the controller CPU in industrial automation systems. ABB’s hardware selector describes the PM856A controller family with Ethernet, serial, and CompactFlash features that align with this platform.
Is 3BSE018104R1 the same as ?
Yes, that ordering information is tied to the listing. Always confirm the exact label on the installed unit before you buy a replacement.
Does it support redundancy?
Yes, listings identify redundancy support, and the AC 800M controller family is built around redundant control options.
Can I use it without the right base plate?
No. The AC 800M controller family uses a dedicated base plate, so the kit and base plate need to match. Do not assume any similar ABB controller will fit.
Is it hot-swappable?
No. Kill power, verify discharge, and follow lockout/tagout before removal or installation.
Why do sellers call it new surplus or refurbished?
Because active factory stock is limited and many units come from unused inventory or restored spares. That is normal for older ABB controller hardware.
What should I check before ordering?
Match the exact model, ordering code, base plate, and the controller family. For AC 800M, the wrong kit wastes time fast because the CPU, plate, and site config all have to line up.
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