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The output modes of safety grating are: relay output, NPN/PNP output, dual NPN output, dual PNP output, controller output, etc. Relay output: refers to the safety light curtain built-in small relay, by a group of normally open normally closed passive bottom output, can be connected to any load. NPN/PNP output: NPN and PNP output at the same time, can be selected according to the actual needs of one of the output, can be connected to PLC, PC or external relay. Dual NPN output: can be connected to two load PLC, PC, or external relay or safety relay output. Dual PNP output: can be connected to two load PLC, PC or external relay or safety relay output. Controller output: The controller can provide the working power required by the safety grating, and the safety grating can be directly driven by the controller. As for which output mode should be selected, it should be selected according to the security requirements and specific needs of your device. There is no best, only the most suitable. ESPE safety grating output mode is diverse, if you do not know how to choose, you can put your equipment needs and circumstances, tell the grating engineer, let them help choose the more appropriate output mode.