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In order to provide the safety function the system must continue to operate correctly under all foreseeable conditions. So how do we design a system to achieve this, and when we have done that, how do we show it?

Safety light curtains are an advanced method of safeguarding personnel around many hazardous machines. Also called light screens, optical guards, and presence sensing devices, safety light curtains offer freedom, flexibility and reduced operator fatigue when compared with traditional guarding methods such as mechanical barriers, sliding gates and pull-back restraints.