Safe Direction (SDI)

The SDI function ensures that the drive can only rotate in the selected direction.


A deviation from the currently monitored direction of motion/rotation is reliably detected and the configured autonomous fault response of the drive is initiated. It is possible to monitor both directions of motion optionally.


The SDI function is used if the drive must only move in one direction. A typical application is to make a danger zone accessible to the operator, provided the machine is moving in the safe direction, i.e. away from the operator. In this status, the operator can safely feed material into or remove it from the work area.

Customer benefits

The function does away with the use of external components such as speed monitors and the associated wiring expense. The release of a danger zone while the machine is moving away from the operator also raises productivity. Without the SDI function, the machine would have to be stopped safely while material was fed in or removed.