If none of the control keys are pressed, the display illumination will switch off once the set “return time illumination” (setting in menu tree: “Par/Conf/LOC”) has elapsed. Pressing any of the control keys will turn the display illumination on again. In this case the control action that is normally triggered by that key will not be executed. Reactivation of the display illumination is also possible by using a binary input.

If continuous display illumination is required, the function “return time illumination” (LOC: Return time illumin.) is set to blocked.