ABB AC500-S Modules Including PM857K01

Name: ABB AC500-S Modules Including PM857K01
Brand: ABB

Model: PM857K01

Brand ABB

Series Including PM857K01

Model PM857K01

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Technical Dossier

Product Details And Specifications

ABB AC500-S Series Technical Notes

The ABB AC500-S is ABB's dedicated functional safety PLC platform, engineered for deployment in safety-instrumented systems (SIS) across the global process and discrete manufacturing industries. Installed in chemical plants, nuclear facilities, offshore platforms, refineries, and steel mills, the AC500-S platform holds TÜV Rheinland certification for SIL 3 (IEC 62061) and PLe / Category 4 (ISO 13849-1). Its modular architecture allows engineers to construct safety loops ranging from simple machine guarding to complex emergency shutdown systems (ESD) and burner management systems (BMS).

The platform operates in conjunction with the standard ABB AC500 CPU infrastructure, using a dedicated safety CPU (PM8xx-S series) that communicates with standard I/O and safety I/O modules over the S-Bus backplane. This hybrid architecture reduces total system cost while maintaining certified safety integrity. As of 2026, the AC500-S platform is in its mature phase, with ABB continuing to support existing installations while directing new projects toward the AC500-S V3 generation.

The Evolution of AC500-S Architecture

The AC500-S platform was introduced in the mid-2000s as ABB's response to the growing demand for IEC 61508-certified safety controllers in process automation. The original architecture centered on the PM851K01 and PM856K01 safety CPUs, which provided SIL 2 and SIL 3 capability respectively on the first-generation AC500 backplane (TB5xx series).

The second generation introduced the PM857K01 and PM857K02 processors, featuring expanded memory, faster cycle times, and improved diagnostics. These units retained backward compatibility with first-generation I/O modules, protecting existing capital investment. The communication architecture evolved from proprietary S-Bus to support PROFIBUS DP, PROFINET, and EtherNet/IP safety profiles, enabling integration with modern DCS environments including ABB System 800xA.

AC500-S Full Catalog & Functionalities (SKU List)

Safety CPUs / Processors

PM851K01: Safety CPU, SIL 2, 1st-gen AC500-S, 256 KB safety program memory, S-Bus master.
PM856K01: Safety CPU, SIL 3, 1st-gen AC500-S, 512 KB safety program memory, dual-channel architecture.
PM856K02: Safety CPU, SIL 3, enhanced variant with extended I/O capacity and faster scan cycle.
PM857K01: Safety CPU, SIL 3 / PLe, 2nd-gen AC500-S, 1 MB safety memory, PROFIBUS DP integrated.
PM857K02: Safety CPU, SIL 3 / PLe, 2nd-gen AC500-S, expanded memory, TÜV-certified, primary spare for PM857K01.
PM865K01: Safety CPU, SIL 3, V3 generation, 64-bit, EtherNet/IP Safety, FSoE support.
PM865K02: Safety CPU, SIL 3, V3 generation, redundancy-capable, cybersecurity hardened.

Safety Digital Input Modules (DI)

DI581-S: 8-channel safety DI, SIL 3, 24 VDC, single/dual-channel input wiring, diagnostic coverage >99%.
DI582-S: 16-channel safety DI, SIL 3, 24 VDC, suitable for high-density ESD input marshalling.
DI585-S: 8-channel safety DI, SIL 3, HART-capable inputs, process industry optimized.

Safety Digital Output Modules (DO)

DO581-S: 4-channel safety DO, SIL 3, 24 VDC / 2A per channel, solid-state output with diagnostics.
DO582-S: 8-channel safety DO, SIL 3, 24 VDC, suitable for solenoid valve and relay driving in ESD systems.

Safety Analog Input Modules (AI)

AI581-S: 4-channel safety AI, SIL 2, 4–20 mA / 0–10 V, for pressure and temperature transmitter inputs.
AI582-S: 8-channel safety AI, SIL 3, 4–20 mA, HART pass-through, high-accuracy process measurement.

Communication & Power Modules

CM589-PNIO-S: PROFINET IO safety communication adapter, PROFIsafe protocol, connects AC500-S to PROFINET networks.
CM592-DP-S: PROFIBUS DP safety communication module, F-Device capability, legacy DCS integration.
PS501-PROG-S: Safety programming license and runtime for Automation Builder, required for AC500-S project development.
TB5600: Terminal base / backplane for AC500-S I/O modules, 6-slot, DIN rail mount, S-Bus backplane.
TB5610: Terminal base, 10-slot expansion, for high-density safety I/O configurations.

Sourcing Hard-to-Find & Obsolete AC500-S Parts

The AC500-S V1 and V2 hardware lines (PM851K01, PM856K01, PM856K02, DI581-S, DO581-S, AI581-S) are in the mature-to-end-of-life phase of their product lifecycle. ABB has issued end-of-sale notices for several first-generation modules, with extended support available only through authorized service agreements. For plant operators running these systems, the practical options are:

Quality Control for the AC500-S Range

The AC500-S platform presents specific quality control challenges due to its safety-rated backplane communication and dual-channel internal architecture. Standard visual inspection and power-on testing are insufficient for safety PLC modules. DriveKNMS applies the following protocol to all AC500-S units:

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