ABB PM861AK01｜Processor Unit｜

ABB PM861AK01 (Part No. 3BSE018157R1) is a high-performance processor unit in the AC 800M controller family for ABB System 800xA. It is designed for medium- to large-scale process automation applications and supports CPU redundancy, making it suitable for industries that require high system availability and continuous operation.

Key Features
High-performance AC 800M CPU
Supports single and redundant controller configurations
Compatible with ABB System 800xA
Built-in CompactFlash interface for application and firmware storage
Dual Ethernet ports for Control Network communication
Two serial communication ports
Supports up to 12 CEX-Bus communication modules
Modular DIN-rail installation with easy maintenance
Full integration with S800 I/O systems
Main Technical Specifications
Parameter Specification
Manufacturer ABB
Model PM861AK01
Part Number 3BSE018157R1
Product Type AC 800M Processor Unit
Processor MPC860
CPU Clock Frequency 48 MHz
Memory 16 MB RAM
Available Application Memory Approximately 7.15 MB
Flash Memory CompactFlash supported
Firmware Flash 2 MB
Power Supply 24 VDC (19.2–30 VDC)
Typical Power Consumption 6.0 W
Maximum Power Consumption 10.3 W
Protection Rating IP20
Mounting DIN Rail
Weight Approximately 1.1–1.2 kg

Communication Interfaces

The PM861AK01 includes:

2 × RJ45 Ethernet ports (CN1, CN2) for the Control Network
COM3: RS-232C serial port with modem control
COM4: Isolated RS-232 service/configuration port
CEX-Bus for communication interface modules
ModuleBus for S800 I/O expansion

Supported communication technologies include:

Ethernet (IEEE 802.3)
PROFIBUS DP (via communication module)
Modbus TCP
IEC 61850 (optional)
FOUNDATION Fieldbus and other industrial protocols through optional communication modules.
Performance
1,000 Boolean operations: 0.23 ms
Minimum application cycle time: 1 ms
Supports up to:
32 applications
64 programs per application
128 diagrams per application
32 tasks per controller

These specifications make the PM861AK01 suitable for demanding continuous-process control applications.

Redundancy

The PM861AK01 supports:

CPU redundancy
Redundant CEX-Bus
Redundant communication interfaces
Redundant S800 I/O
Automatic controller switchover in ≤10 ms

These features help maximize system availability and minimize process interruptions.

Typical Applications

The PM861AK01 is widely used in:

Power generation
Oil & gas production and refining
Chemical and petrochemical plants
Pulp & paper mills
Water and wastewater treatment
Mining and metals
Pharmaceutical manufacturing
General industrial process automation
Standard Kit Contents

PM865K02 3BSE031150R1