PSSu E F AI I-R 315260 PSSu, electronic module, failsafe, analogue inputs and outputs, 1 input,0 – 25.59 mA, dual-pole, differential input, resolution 12 Bit, potential-free, for railway applications. The PSSuniversal Assistant is used for selection of the modules and for configuration of the decentralised I/O system PSSuniversal.