Description

The ABB PM857K02 (3BSE088386R1)​ is a High-Integrity Redundant Controller Unit​ for the AC 800M​ process automation family. It is a complete 1:1 hot standby CPU package​ designed for mission-critical applications requiring both high availability and functional safety (up to SIL 3​ according to IEC 61508). The unit combines standard process control with safety logic in a single hardware platform. It features a 96 MHz processor, 32 MB memory, and supports full redundancy for CPU, CEX bus, communication, and S800 I/O. It is primarily used in oil & gas, power generation, and chemical industries for applications like emergency shutdown (ESD) and burner management systems (BMS).

Application Scenarios

In a natural gas compressor station, the ABB PM857K02​ serves as the central redundant controller for the emergency shutdown (ESD) system. It continuously monitors gas pressure, temperature, and fire & gas detection signals. The 1:1 hot standby redundancy​ ensures that if the primary CPU fails (due to hardware fault or extreme temperature), the secondary CPU takes over control within milliseconds (<10 ms), preventing an uncontrolled shutdown and maintaining pipeline integrity. The integrated SIL 3 capability allows it to execute both basic process control and critical safety interlocks on the same hardware.

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