ABB

Core Functions

PM861AK02 is a 1:1 hot‑standby redundant CPU kit. Two CPUs work in active‑standby mode, achieving bumpless switch‑over when primary CPU fails.

1. Real‑time process control logic execution Runs IEC 61131‑3 control programs: PID closed‑loop control, sequential logic, interlock, motor and valve control. Reads field data from S800 I/O modules via Modulebus optical communication, outputs control commands to field devicesABB Group.
2. 1:1 Hot‑standby CPU redundancy Dual‑CPU redundant architecture. The backup CPU keeps fully synchronized with the primary unit. On primary‑CPU fault, seamless switch‑over within short time, no process shutdown. Built‑in RNRP redundant network support for control‑network high availability.
3. Multi‑protocol system communication Dual‑port on‑board Ethernet; supports Modbus‑TCP, Profinet, Profibus‑DP, IEC 61850, DNP3. Connects to System 800xA operator HMI, third‑party PLC, ABB drives, motor‑protection relays, SCADA systems. RS‑232 port for engineering‑tool debugging and configuration.
4. I/O system management Communicates with distributed S800 I/O racks through optical Modulebus, manages large‑scale analog and digital field‑signal data. Can expand via CEX‑bus communication modules for extra field‑bus interfacesABB Group.
5. Diagnostics, event logging & status monitoring Built‑in self‑diagnosis for CPU, memory, communication and I/O status. Stores event logs and fault records. Front‑panel LEDs indicate power, run, fault and communication status. Application programs are stored on compact‑flash memory cardABB Group.
6. Multi‑task real‑time operation Supports priority‑based task scheduling, runs high‑speed time‑critical control loops and slower process‑optimization algorithms at the same time, stable for complex continuous‑process applications.More products: www.plcva.com

Hardware Interfaces

• 24 VDC power supply input
• Dual‑port on‑board Ethernet for control‑network connection
• RS‑232C serial port for engineering‑tool debugging
• Optical Modulebus interface for S800 I/O connection
• CEX‑bus expansion slot for adding communication interface modules
• Compact‑flash memory card slot for application firmware storage
• Front‑panel status LEDs, reset button
• DIN‑rail mounting on TP830 baseplate

ABB PM861AK02 3BSE018160R0001 CPU Module

Main Applications & Deployment Sites

Core Application: Redundant high‑availability process controller for ABB System 800xA / AC 800M DCS, for mission‑critical continuous industrial process‑automation projects.

1. Thermal & Hydro Power Plants Boiler, turbine and auxiliary‑system DCS control; water‑steam‑cycle control, fan/pump motor control, plant‑process interlock logic.
2. Oil & Gas, Refineries & Petrochemical Plants Reactor, distillation‑unit and pipeline process‑control systems; high‑availability control for upstream and downstream oil‑gas facilities.
3. Cement, Pulp & Paper, Metallurgy Heavy‑Industry Paper‑machine control, kiln and mill‑drive control, large‑scale continuous‑production‑line automation.
4. Offshore Oil‑Gas Platforms Offshore‑platform automation control, for harsh vibration‑resistant marine‑grade applications.
5. Water‑supply & Waste‑water Treatment Plants Large‑scale water‑treatment‑plant DCS control systems.
6. Chemical & Pharmaceutical Plants Batch‑process and continuous‑process automation, safety‑interlock logic control.

Key distinction summary for reference:

• PM861AK02: AC800M redundant DCS CPU controller kit, core of System 800xA DCS.
• PM‑series (PM851A‑PM891): Other AC800M CPU variants, different performance and redundancy levels.
• SM811/SM812: SIL‑certified safety‑supervision coprocessor modules.
• DSAI130A: S800 analog‑input I/O board for field‑signal acquisition.
• REM620: Motor‑protection IED for motor fault protection.
• REF610: Feeder‑protection relay for medium‑voltage distribution‑line protection.
• UFC911B101: Medium‑voltage‑drive main‑control CPU board.
• UNITROL 1020: Generator excitation AVR regulator.

Understand the lowest price, please contact via email: plcvarious@foxmail.com

More products: www.plcva.com

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