PSSu E F 4DO 0.5-R 315210 PSSu, electronic module, failsafe, digital inputs and outputs, 4outputs, 0.5 A, single-pole, positive-switching, short-circuit proof,overload-proof, free from feedback, for railway applications. PSSuniversal – PLC Controller PSSu, head module with increased performance, control system PSSu PLC, failsafe and standard, PL e, SIL CL 3, 2 RJ45