ABB PM861AK02 3BSE018160R1 Redundant Processor Unit

ABB 3BSE018160R1 (PM861AK02) is a high‑availability redundant processor unit designed as the core 

control unit for ABB’s AC 800M and 800xA distributed control systems (DCS). It features a dual‑CPU redundant architecture, 

ensuring uninterrupted operation in the event of a primary processor failure—critical for power, chemical, metallurgy, and other high‑reliability industrial processes. 

The unit integrates high‑speed data processing, logic execution, and multi‑protocol communication, making it the central “brain” for managing large‑scale I/O systems and complex control loops.

Parameter Value

Order Number 3BSE018160R1

Model PM861AK02

Product Type Redundant Processor Unit (RPU)

System Compatibility AC 800M, 800xA DCS

Power Supply 24 VDC

Current Consumption ~3.0 A (typical)

Memory 32 MB RAM / 8 MB Flash

Communication Interfaces 2× Ethernet (RJ45), ModuleBus, COM3

Supported Protocols Profinet, Modbus, Ethernet/IP, Modulebus DP/V3

Mounting DIN Rail / Cabinet Mount

Protection Class IP20 (per EN 60529)

Operating Temperature 0°C to +60°C

Dimensions 135 × 186 × 119 mm

Weight 2.9 kg

Certifications CE, UL, CSA

Core FeatureDual‑CPU Hot Standby Redundancy