WAGO I/O System 750/753 Item no. 750-667/000-004 Fail-safe 4/4 channel digital input/output; 24 VDC; 2 A; PROFIsafe Item no. 750-667/000-004 Fail-safe 4/4 channel digital input/output Downloads as zip Download Compare Configure Item no. 750-667/000-004 Fail-safe 4/4 channel digital input/output Downloads as zip Download Compare Configure