PSSu H PLC2 FS SN SD 312077 Head module, SafetyNET p, PL e, SIL CL3 PSSuniversal PLC is the “all-rounder” of the PSS 4000 automation system. The programmable logic controller (PLC) can be programmed in the main EN/IEC 61131-3 languages for standard and safety tasks and can be configured using the graphics program editor PASmulti. Standardisation is easy, thanks to ready-made software blocks.