The ABB PM866AK01 3BSE076939R1 is an AC 800M Processor Unit designed for ABB System 800xA automation and control systems. It features a 133 MHz CPU and 64 MB memory and serves as the central processing unit for executing control logic, managing connected I/O and coordinating communication with other automation system components. ABB specifies this article number as 3BSE076939R1 (PM866AK01).
The PM866AK01 is suitable for process automation, industrial control, power and energy applications, manufacturing and other distributed control environments. The controller provides Ethernet and RS-232 communication interfaces and supports S800 I/O through the ModuleBus, while its modular design allows the AC 800M system to be expanded according to application requirements.
Main Functions & Applications
- Central Control Processing – Executes application programs and control logic within the AC 800M automation system.
- I/O Management – Communicates with connected S800 I/O modules and manages field-level control signals.
- Industrial Communication – Provides Ethernet Control Network connectivity together with RS-232 service and communication interfaces.
- Process Automation – Suitable for continuous and batch process control applications using the ABB System 800xA platform.
- Modular System Integration – Supports CEX-Bus and ModuleBus expansion for integrating communication and I/O modules.
- System Maintenance & Replacement – Suitable as a replacement processor unit for existing AC 800M installations.
Recent Warehouse & Shipment Photos
The photos below are from our actual warehouse or shipment records and are provided for model identification and product reference.

ABB PM866AK01 3BSE076939R1

ABB PM866AK01 3BSE076939R1

ABB PM866AK01 3BSE076939R1

ABB PM866AK01 3BSE076939R1
