PSSu E F AI U-R 315265 PSSu, electronic module, failsafe, analogue inputs and outputs, 1 input,- – 10.24 – 10.23 V, dual-pole, differential input, resolution 13 Bit, for railway applications. The PSSuniversal Assistant is used for selection of the modules and for configuration of the decentralised I/O system PSSuniversal.