PSSu E F 2DO 2-R 315215 PSSu, electronic module, failsafe, digital inputs and outputs, 2outputs, 2 A, single-pole, positive-switching, short circuit-proof,overload-proof, free from feedback, for railway applications. The PSSuniversal Assistant is used for selection of the modules and for configuration of the decentralised I/O system PSSuniversal.