Product Overview

• PN: PM861AK01
• Official Order Code: 3BSE018157R1
• Brand: ABB
• Series: AC 800M Controller, System 800xA Distributed Control System
• Type: Full Set Processor Unit Assembly

• Function: It serves as the core computing and control master unit of AC800M automation system. It executes IEC61131-3 standard control programs, completes PID closed-loop regulation, interlock logic judgment, sequence control and process data arithmetic. It collects analog and digital signals from S800 I/O modules via ModuleBus and CEX expansion bus, sends output instructions to field execution equipment, and realizes data interaction with operator stations, engineering stations and upper monitoring network through dual Ethernet interfaces. The complete kit contains CPU main body, installation baseplate, bus terminators and backup battery, ready for direct cabinet installation and commissioning.

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Standard Kit Contents

1. PM861A CPU main controller module
2. TP830 DIN rail mounting baseplate
3. TB850 CEX-bus terminator
4. TB807 ModuleBus terminator
5. TB852 RCU-Link redundant link terminator
6. RAM memory backup lithium battery

7. Power terminal plug connector

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Core Features

• Built-in dual independent RJ45 Ethernet ports for control network communication, supports network redundancy to prevent single link failure
• Equipped with RS232 debugging serial port for program download, fault diagnosis and local parameter setting
• Supports 1+1 dual CPU redundant hot backup, bumpless automatic switching within 10ms when the primary controller fails
• CEX expansion bus can access up to 12 pieces of communication interface modules such as Profibus DP, Modbus and Fieldbus
• Onboard LED indicator group clearly displays power, running status, bus communication, fault alarm and redundant working mode
• CompactFlash card slot for program storage and project backup, external battery prevents data loss after power off
• PCB conformal coating treatment, dustproof, moistureproof and anti-electromagnetic interference, adapts to long-term continuous operation in industrial control rooms
• Sliding lock DIN rail installation structure, supports hot plug replacement under redundant power supply without system shutdown

• Complete hardware self-diagnosis function, supports SOE sequence of event recording for fault traceability

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Technical Specifications

• Input Power Supply: 24VDC
• Operating Temperature: -25℃ ~ +70℃
• Storage Temperature: -40℃ ~ +85℃
• Physical Dimension: 189mm(H) × 135mm(W) × 119mm(D)
• Net Weight: 1.15kg
• Communication Protocols: Modbus TCP, Profibus DP, OPC UA, ABB proprietary control network protocol
• HS Code: 85371091
• Certifications: CE, UL

• Supply Status: Mass production available, brand new original sealed complete sets and fully tested refurbished spare parts are in stock

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Compatibility

• Applicable System: ABB System 800xA, AC 800M PLC/DCS control system
• Matched I/O Series: S800 AI/DI/AO/DO modules and corresponding TU terminal bases
• Programming Software: Control Builder M engineering configuration software
• Redundancy Scheme: Two sets of PM861AK01 form redundant control pairs via RCU-Link connection

• Expansion Mode: Expand multi-protocol communication modules through CEX bus slot

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Application

• Whole-process automatic control for petrochemical, oil & gas and chemical production line DCS systems
• Boiler, turbine and auxiliary equipment monitoring & interlock control in thermal power generating units
• Automatic control of flue gas desulfurization, denitrification and wastewater treatment environmental protection equipment
• Cabinet renovation, module replacement and spare part stocking for on-site ABB 800xA automation control projects