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2. Product Core Brief
- Model: PM858K01 (3BSE082895R1)
- Brand: ABB
- Series: ABB AC 800M / System 800xA
- Core Function: Executes PLC/DCS control logic
- Product Type: PLC / DCS CPU Controller
- Key Specs: 33 MHz CPU, 16 MB RAM, dual Ethernet control network ports
- Condition: New Original / New Surplus
3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Model | PM858K01 |
| ABB Article Number | 3BSE082895R1 |
| Platform | AC 800M Controller |
| Processor | MPC866, 33 MHz |
| RAM Memory | 16 MB |
| Application RAM | ~7.147 MB available |
| Flash Storage | Yes |
| Performance | 0.36 ms per 1000 Boolean operations |
| Ethernet Ports | 2 × RJ45 (Control Network) |
| Serial Ports | 2 × RJ45 (COM3 RS-232, COM4 configuration) |
| Power Supply | 24 V DC (19.2–30 V DC) |
| Power Consumption | ~210 mA typical, 360 mA max |
| Operating Temperature | +5 °C to +55 °C |
| Protection Rating | IP20 |
| Dimensions | 119 × 186 × 135 mm |
| Weight | ~1.2 kg |
The PM858K01 CPU board contains the microprocessor, RAM, real-time clock, CompactFlash interface, status LEDs, and initialization controls used by the AC800M automation platform.
- PM858K01
4. Product Introduction
The ABB PM858K01 (3BSE082895R1) is a processor unit used in the AC 800M controller family within ABB System 800xA distributed control systems. The CPU executes automation logic, manages field communication modules, and coordinates I/O data exchange with S800 I/O racks and fieldbus networks.
In typical deployments—chemical plants, power generation units, water treatment facilities, and heavy manufacturing—the PM858K01 runs process control programs configured in Control Builder and communicates through Ethernet control networks and expansion communication modules.
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Controller completely dead | 24 V supply missing | ❌ Low | Measure 24 V DC at controller power input | Check cabinet power supply and wiring |
| RUN LED off after power-up | Firmware missing or corrupted | ⚠️ Medium | Connect engineering workstation via COM4 | Reload firmware through Control Builder |
| Ethernet communication lost | Network switch or cable issue | ❌ Low | Ping controller IP through engineering station | Check network infrastructure |
| Controller repeatedly rebooting | CPU hardware fault | ✅ High | Check diagnostic buffer in 800xA system | Replace controller if fault confirmed |
| I/O modules not detected | Modulebus termination missing | ⚠️ Medium | Verify TB807 terminator installed | Correct bus termination and restart |
Field experience: AC800M CPUs rarely fail outright. More often the issue is a missing ModuleBus terminator or network misconfiguration.
If diagnostics remain unclear, capture screenshots from Control Builder diagnostics before replacing hardware.
6. Frequently Asked Questions (FAQ)
Q1: What system uses the PM858K01 controller?
It belongs to the ABB AC 800M controller family, used inside System 800xA DCS architectures for process automation. The CPU manages logic execution, communication modules, and I/O racks.
Q2: Does the PM858K01 support redundant controllers?
The K01 version is a single controller configuration. For redundant CPU setups ABB offers the PM858K02 package, which includes two controllers and redundancy components.
Q3: What communication interfaces are built into the CPU?
The controller includes:
- 2 × Ethernet control network ports
- 1 × RS-232 service port
- 1 × configuration serial interface
Additional protocols such as Profibus DP or Modbus are added through communication modules on the CEX-Bus.
Q4: Can I replace the CPU without shutting down the cabinet?
No. AC800M CPUs are not hot-swappable in standard configurations. Removing the CPU under power can corrupt the backplane communication bus.
Power down the rack before replacement.
Q5: Will my PLC program be lost if I change the CPU?
Programs are stored in the controller memory and engineering backups. Before replacement, always export the Control Builder project to avoid losing application logic.
Q6: What usually causes AC800M CPU replacement?
From field experience, most replacements happen due to:
- Lightning or surge damage
- Improper grounding in large plants
- Incorrect firmware upgrades
Hardware failures are relatively rare.
Q7: What comes in the PM858K01 package?
The typical ABB package includes:
- PM858 CPU module
- TP830 baseplate
- TB850 CEX-Bus terminator
- TB807 ModuleBus terminator
- Battery for memory backup
Licenses are not included and must be configured in the control system software.
