ABB PM866AK01 (Part No.3BSE076939R1) is a high-performance original DCS central CPU processor designed for ABB AC800M and System 800xA distributed control system, functioning as core operation and control hub for medium and large-scale process automation. All available items are genuine factory-original products manufactured in accordance with ABB’s strict European production specifications, completing long-time burn-in aging, full-function detection and EMC anti-interference certification before leaving factory. Our warehouse maintains abundant spot inventory and supports fast worldwide shipping toward Asia, Middle East, Europe and North America to meet customers’ urgent spare replacement, cabinet upgrade and new project deployment across thermal power plants, petrochemical facilities, metallurgical rolling mills and environmental protection factories. Built on mature 32-bit RISC industrial processor architecture, this CPU delivers outstanding real-time computing capacity and stable round-the-clock continuous operation, with optional redundant hot backup configuration for critical non-stop production sites.

Detailed Technical Specifications

Processor & Memory Parameters

Equipped with 133MHz high-speed main frequency processor, PM866AK01 completes 1000 Boolean logic calculations within only 0.09ms to satisfy high-speed closed-loop process control and sequential logic execution requirements. It is configured with total 64MB onboard memory, enough free RAM reserved for user application programming, while non-volatile Flash memory permanently stores control programs and system configuration parameters. Built-in replaceable 3.6V lithium backup battery effectively prevents key parameter loss during unexpected power cut without additional external storage devices. The module supports up to 32 prioritized independent tasks to separate fast closed-loop control and low-priority background monitoring tasks, optimizing system resource allocation and avoiding operation congestion. Under redundant pairing mode, master-slave CPUs synchronize real-time data with switching time below 10ms without disturbing field I/O operation.

Bus Expansion & Communication Performance

Through Modulebus backplane bus, single non-redundant CPU can expand up to 96 S800 series analog and digital I/O modules; redundant layout limits expandable I/O quantity to 84 modules for higher reliability. Reserved CEX expansion bus allows installation of maximum 12 external communication modules for multi-fieldbus protocol expansion. Dual independent 10/100Mbps Ethernet ports follow IEEE802.3 standard and support RNRP redundant network protocol to build fault-tolerant control network; two onboard RS232 ports are separately used for program download and on-site equipment debugging. By matching external communication cards, it seamlessly connects third-party devices via Modbus TCP and PROFIBUS DP. Rated input voltage is 24VDC with wide fluctuation range 19.2~30VDC, typical power consumption 5.1W and peak full-load power consumption 8.6W.

Mechanical & Environmental Index

Overall dimension:186mm×119mm×135mm, net weight around 1.2kg, standard DIN rail installation for quick cabinet mounting and plug-and-play maintenance. Front panel reaches IP20 protection grade against floating dust and accidental live terminal contact. Continuous working ambient temperature: +5℃~+55℃, storage temperature:-40℃~+70℃, applicable humidity 5%~95% non-condensing RH. Certified by CE and UL, it runs steadily under strong electromagnetic interference near high-power inverters and large industrial motors.

Core Advantages & Industrial Application

Program development follows IEC61131-3 international standard and matches ABB Compact Control Builder software for convenient offline programming and online troubleshooting. Its redundant design greatly reduces unplanned production downtime for continuous-process enterprises. Widely applied in power plant boiler control, chemical reactor automatic regulation and steel rolling tension control, original PM866AK01 features low failure rate and long service life.
Supported by sufficient in-stock resources and efficient international logistics, we arrange prompt delivery globally all year round. As OEM designated replacement CPU for System 800xA DCS, PM866AK01 keeps stable original quality and becomes a preferred spare part in global automation aftermarket.