PSSu K F EI 312433 PSSu, compact module, failsafe, counter, safe motion monitoring,2 outputs, failsafe, 0.5 A, single-pole, positive-switching, shortcircuit-proof, overload-proof, free from feedback, 1 output, standard, 0.5 A,single-pole, positive-switching, short circuit-proof, 1 combined input and output CIO for cascading, standard, 1 input for encoder, Mini-IO female connector, 8-pin, 2 inputs for proximity switch.