ABB PM866A (3BSE076359R1) High Performance Processor Unit for AC800M / System 800xA DCS Platform

ABB PM866A with material code 3BSE076359R1 is a mid-to-high performance central processor unit belonging to ABB AC800M programmable automation controller series, 

serving as the core computing brain of System 800xA distributed control system. It executes real-time closed-loop PID regulation, sequential interlock logic, advanced process control algorithms, 

S800 I/O signal collection & calculation, and bidirectional data interaction between local rack modules, remote I/O stations and upper HMI/SCADA platforms.

Equipped with mature industrial processor architecture and large-capacity onboard memory, it supports large-scale I/O tag scheduling and complex multi-loop control tasks, and can 

be configured into master-standby redundant architecture with ultra-fast bumpless failover to eliminate single-point failure risks for critical production processes. Built-in dual independent 

Ethernet and multi-channel serial communication ports, it supports RNRP redundant network protocol and mainstream industrial bus expansion, realizing seamless interconnection with inverters, 

third-party PLCs and intelligent field instruments. It is the core maintenance spare part for system commissioning, fault replacement, renovation and spare inventory backup in petrochemical, 

power, metallurgy and other process industries.

Technical Specifications

Part Number: PM866A

Material Code: 3BSE076359R1

Manufacturer: ABB, Origin: Sweden

CPU Architecture: 32-bit PowerPC industrial processor

System RAM: Large-capacity onboard RAM, supports mass I/O point operation

Onboard Storage: Flash firmware storage, Compact Flash card program expansion slot

Programming Standard: IEC 61131-3 (ST, LD, FBD, IL, SFC)

Engineering Software: Compact Control Builder M

Onboard Communication Interfaces

2× Independent Ethernet ports (RNRP redundant network supported)

2× Configurable RS232/RS485 serial ports (COM3/COM4, one isolated for commissioning)

Redundancy Switchover Time: ≤50ms for master/standby CPU pair

Matching Baseplate: TP830 DIN rail backplane

Power Supply: 24VDC ±10% rack backplane power supply

Typical Power Consumption: 5.1W, Max 8.6W

Installation Mode: Slide & Lock DIN rail plug-in modular installation

Operating Temperature: -20℃ ~ +60℃

Storage Temperature: -40℃ ~ +85℃

Humidity: 5%–95% Non-Condensing

Protection Class: IP20 (Cabinet internal installation)

EMC Compliance: EN 61000-6-2, EN 61000-6-4 industrial electromagnetic standard

Certifications: CE, UL508, ISA Secure certified

Net Weight: Approx. 0.45kg

Key Features

Stable industrial processor design, powerful arithmetic capability to undertake complex advanced control algorithms and large-volume real-time process calculation tasks.

Complete master-standby hot redundant function, automatic seamless switching without program interruption, ensuring uninterrupted operation of critical control loops.

Dual Ethernet redundant network + dual serial port layout, compatible with Modbus TCP, RNRP, IEC 60870-5-103 and other mainstream communication protocols.

Front panel LED indicators for power, run, fault and communication status, convenient for on-site rapid fault diagnosis and troubleshooting.

Hot-swap compatible structure, supports online module replacement without system shutdown to reduce production maintenance downtime.

Modular expansion architecture, freely matched with analog/digital I/O modules and communication expansion cards to flexibly expand system scale.

Industrial-grade anti-interference circuit design, long-term stable continuous operation under strong electromagnetic environment inside control rooms.

Native hardware matching with ABB System 800xA platform, convenient for centralized plant-wide automation management and system upgrade expansion.