Couplers & I/O modules: Item no. 750-665/000-001Fail-safe 4/4 channel digital input/output; 24 VDC; 0.5 A; PROFIsafe1 of 4Color: Fail-safe 4/4 channel digital input/output; 24 VDC; 0.5 A; PROFIsafePlease wait ...PU (SPU): 1 PieceAdd to shopping cartGenerate DatasheetCompareAdd to Watchlist Fail-safe 4/4 channel digital input/output; 24 VDC; 0.5 A; PROFIsafePlease wait ...PU (SPU): 1 PieceAdd to shopping cartGenerate DatasheetCompareAdd to Watchlist