ABB PM851 3BSE018169R1 Power Supply Module

Technical Dossier

Product Details And Specifications

ABB PM851 Series Technical Notes

The ABB PM851 is a processor and power supply module belonging to the AC800M controller family, ABB's flagship DCS/PLC platform deployed across global heavy industry. The AC800M system — and the PM851 series within it — holds significant installed base in petrochemical refineries, nuclear power auxiliary systems, pulp and paper mills, offshore oil and gas platforms, and large-scale chemical processing facilities. The PM851 3BSE018169R1 specifically functions as a combined CPU and power supply unit, providing the computational core and regulated DC power distribution for the AC800M controller rack. Its dual-function architecture reduces rack footprint and simplifies cabling in space-constrained control cabinets. The AC800M platform, including PM851 variants, is certified for use in SIL-rated safety loops when paired with appropriate safety I/O modules, making it a standard reference in IEC 61511 compliant installations.

The Evolution of PM851 Architecture

Q: How are RFQ terms confirmed?
A: Quantity, required condition, documentation needs, destination and sourcing route are confirmed during RFQ review before quotation.

The PM851 communicates with I/O modules via the S100 I/O bus and supports the CI854/CI857/CI858 communication interface modules for PROFIBUS DP, FOUNDATION Fieldbus H1, and HART integration respectively. As the AC800M platform matured, ABB introduced the PM891 and PM895 as functional successors, offering faster cycle times and expanded memory. However, the PM851 remains in active service across thousands of installed systems globally, and its 3BSE018169R1 hardware revision continues to be the most widely referenced spare part number in maintenance BOMs for plants commissioned between 2000 and 2015. Compatibility between PM851 hardware revisions and specific Control Builder M software versions must be verified against ABB's firmware compatibility matrix prior to replacement.

PM851 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified components within the ABB AC800M PM851 ecosystem and associated module families. Each entry reflects a distinct hardware article number used in ABB's spare parts and engineering documentation.

Quality Control for the PM851 Range

The PM851 3BSE018169R1 integrates a combined CPU and power regulation circuit on a single PCB assembly, requiring specialized test procedures that address both computational and power delivery functions simultaneously. DriveKNMS applies the following verification protocol to all PM851 units prior to dispatch:

Q: How is condition confirmed before quotation?
A: Available condition, photos, test records and documentation are checked according to the requested model and sourcing channel before a formal RFQ response.