ABB PM866 Modules: PM866K01 3BSE050198R1 Processor Unit

Technical Dossier

Product Details And Specifications

ABB PM866 Series Technical Notes

The ABB PM866 is a high-performance processor module within the AC 800M controller platform, ABB's flagship DCS/PLC architecture deployed across global heavy industry. The AC 800M system — and the PM866 processor family specifically — holds a dominant installed base in continuous-process industries including petrochemical refineries, nuclear power generation auxiliary systems, offshore oil & gas platforms, pulp and paper mills, and large-scale chemical plants. The PM866K01 (3BSE050198R1) represents the current-generation processor unit in this line, offering dual Ethernet ports, extended memory, and compatibility with the full S800 I/O range via ModuleBus. Its architecture is designed for high-availability applications where controller redundancy and deterministic scan times are non-negotiable operational requirements.

The Evolution of PM866 Architecture

The AC 800M processor lineage began with the PM810 and PM820 modules in the late 1990s, establishing the foundational ModuleBus backplane communication protocol and the CEX-Bus expansion architecture. The PM851 and PM856 generations introduced redundant CPU configurations and expanded the supported I/O node count, making the platform viable for plant-wide DCS deployments. The PM860 series marked the transition to faster processors and increased application memory, directly addressing the growing complexity of IEC 61131-3 structured text programs in advanced process control (APC) applications.

The PM866 generation represents the current mature architecture. It introduced dual 100 Mbit/s Ethernet ports for direct integration with ABB's Industrial IT and System 800xA environment, onboard flash memory for application storage without battery dependency, and support for up to 64 S800 I/O stations per controller. Backward compatibility with PM860-era hardware is maintained at the rack and CEX-Bus level, though firmware versions must be aligned. The PM866K01 variant (3BSE050198R1) is the standard single-processor configuration; the PM866K02 is the redundant-pair variant used in hot-standby configurations. As of 2026, the PM866 series is in its mature/extended lifecycle phase — ABB continues to supply spare units and firmware updates, but the platform is not receiving new feature development. Migration paths to the AC 800M High Integrity (PM867) or the newer AC 800PEC platform are documented in ABB's lifecycle bulletins.

PM866 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked modules within the ABB AC 800M PM866 ecosystem. Each entry reflects a distinct hardware configuration or accessory role within the platform.

PM866K01 (3BSE050198R1): AC 800M processor unit, single CPU, dual Ethernet, 32 MB application RAM.
PM866K02 (3BSE050198R2): AC 800M processor unit, redundant CPU pair configuration, hot-standby capable.
PM860K01 (3BSE018100R1): Previous-generation AC 800M CPU, single Ethernet port, 16 MB RAM, CEX-Bus compatible.
PM861AK01 (3BSE018161R1): AC 800M processor, enhanced memory variant, compatible with S800 I/O via CI854.
PM865K01 (3BSE031151R1): AC 800M processor with extended I/O node support, predecessor to PM866 line.
CI854AK01 (3BSE025255R1): PROFIBUS DP communication interface module for AC 800M, master/slave configurable.
CI857K01 (3BSE018144R1): FOUNDATION Fieldbus HSE communication interface for AC 800M controllers.
CI858K01 (3BSE018135R1): HART multiplexer communication interface, integrates HART field devices into 800xA.
CI860K01 (3BSE032444R1): FF H1 fieldbus interface module, supports up to 4 H1 segments per module.
CI867K01 (3BSE050198R1): IEC 61850 communication interface for substation automation integration.
SD821 (3BSC610037R1): AC 800M power supply module, 24 VDC input, for S800 I/O stations.
SD822 (3BSC610038R1): AC 800M redundant power supply module, dual-feed configuration.
TB807 (3BSE008516R1): Termination board for AI810/AO810 analog I/O modules, screw terminal type.
AI810 (3BSE008516R1): 8-channel analog input module, 4–20 mA / 0–10 V, 12-bit resolution.
AO810V2 (3BSE038415R1): 8-channel analog output module, 4–20 mA, HART-capable, updated V2 revision.
DI810 (3BSE008508R1): 32-channel digital input module, 24 VDC, for S800 I/O stations.
DO810 (3BSE008510R1): 32-channel digital output module, 24 VDC, 0.5 A per channel.
DP820 (3BSE013228R1): PROFIBUS DP slave interface for S800 I/O, connects remote I/O stations to AC 800M.
MB510 (3BSE002540R1): ModuleBus optical modem for extended-distance I/O node connections.