SDI – Safe Direction

The SDI function prevents movement in an unintended direction. If this condition is violated, the safety sub-function will be triggered and a fault response will be initiated at the same time (usually STO or SS1).

	=	Safety sub-function monitored
	=	Safety sub-function is triggered
v	=	Speed
t	=	Time
t1	=	Point in time when SDI is triggered.
t2	=	Point in time at which SDI is deactivated.