I don't have specific information on a "CML720i-R05-1600.A/D3-M12" model. It seems this might be a specific variant or a hypothetical model within a series. Typically, light curtain receivers like those in the CML720i series are designed for industrial safety, detecting interruptions in light beams to protect personnel and equipment. If you have specific technical details or need information on a similar model, I can help further with that.