The accumulation of undetected faults may lead to a dangerous output. Level 2 - Safety functions shall be checked at least every start up of the machine. When a fault occurs between start up intervals, the safety function may not be performed, and the fault may lead to a dangerous situation at the machine. The fault is detected by the check. When a fault occurs, the safety function may not be performed and may lead to a dangerous situation at the machine.
Some faults remain undetected.
Level 0 - Point of hazard is safe. The rating for the controller is IP-20. This should be placed in an enclosure of at least IP-54. 6. Minimum object resolution is determined by adding together the beam lens diameter and the beam spacing. Use of this formula allows users to make direct comparisons between different light curtains.