PM858K01 (3BSE082895R1) | ABB AC 800M Processor Unit

Overview

The ABB PM858K01 (3BSE082895R1) is a high-performance processor unit for the AC 800M control system, built around an MPC866 microprocessor. It supports complex automation applications with fast task execution, redundancy options, and integrated communication interfaces. Designed for precision and reliability, this unit delivers efficient control performance in distributed and process automation systems.

Core Features

• Processor Type: MPC866

• Clock Synchronization: 1 ms accuracy across AC 800M controllers via CNCP protocol

• Redundant Configuration: Switch-over time ≤10 ms

• Applications per Controller: Up to 32

• Programs per Application: 64

• Diagrams per Application: 128

• Cycle Times: Up to 32 individual cycle settings, as fast as 1 ms per program

• Flash Memory for Firmware: 4 MB

• Backup Battery: Integrated 3.6 V lithium cell

• Power Supply: 24 V DC (range 19.2–30 V DC)

• Power Consumption: 210 mA typical, 360 mA maximum

• Power Dissipation: 5.1 W typical, 8.6 W maximum

• Redundant Power Supply Input: Supported

Communication and Networking

• Ethernet Ports: 2 × RJ-45, IEEE 802.3, 10 Mbit/s

• Control Network Protocols: MMS (Manufacturing Message Service), IAC (Inter Application Communication)

• Recommended Network Backbone: 100 Mbit/s switched Ethernet

• Transmission Speed to OPC Server: 36–86 events/sec and 113–143 data messages/sec

• Event Queue Capacity: Up to 3000 events per OPC client

• RS-232C Interfaces:

• Two general ports (COM3 and COM4), with baud rates from 75 to 19,200

• COM3 supports full RTS/CTS

• COM4 is optically isolated

• Comm. Modules on CEX Bus: Up to 12

• CEX Bus Current Supply: Max 2.4 A

I/O and System Integration

• I/O Clusters with Non-Redundant CPU: 1 electrical + 7 optical

• I/O Clusters with Redundant CPU: 7 optical

• Maximum ModuleBus I/O Capacity: 96 modules (single CPU) or 84 modules (redundant setup)

• ModuleBus Scan Rate: 0–100 ms (depending on module count)

• Electrical ModuleBus Supply:

• 24 V: max 1.0 A

• 5 V: max 1.5 A

• Real-Time Clock Stability: 100 ppm (≈1 hour/year drift)

Application Scenarios

The PM858K01 is ideal for:

• Distributed control systems requiring high reliability and redundancy

• Large-scale process automation in oil, gas, and power generation plants

• Multi-application architectures needing fast cycle times and deterministic communication

FAQ

Q: What distinguishes the PM858K01 from PM856A and PM860K01?
A: The PM858K01 offers faster processing, more I/O capacity, and shorter switch-over times than the PM856A, while maintaining comparable reliability to the PM860K01 in redundant configurations.

Q: Can PM858K01 operate without redundancy?
A: Yes, it supports both single and redundant configurations, providing flexibility for system design.