...Load (e.g., relay) Incident light No incident light 4 3 1 Brown Stability indicator (green) 0 V ZD Through-beam Receivers, Retro-reflective Models, Diffuse-reflective Models 12 to 24 VDC (Con...https://www.ia.omron.com/data_pdf/cat/oil-resistant_components_y215-e1_6_3_csm1053244.pdf