Basic Wiring Solid state 3-wire, NPN Solid state 3-wire, PNP 2-wire (Solid state) 2-wire (Reed switch) Main curcuit of switch Brown Black Blue Load Brown Black Blue Main curcuit of switch Load Brown Black Blue Main curcuit of switch Load Brown Blue Brown Blue Main curcuit of switch Main curcuit of switch Load Load Indicator protection circuit, etc. Brown Blue Brown Blue Indicator protection circuit, etc. Load Load (Power supply for switch and load are separate) Example of Connection with PLC (Programmable Logic Controller) . Sink input specifications 3-wire, NPN . Source input specifications 3-wire, PNP Connect according to the applicable PLC input specifications, as the connection method will vary depending on the PLC input specifications. 2-wire 2-wire Auto switch Auto switch Auto switch Auto switch Black Input COM Brown Blue PLC internal circuit Black Input COM Brown Blue PLC internal circuit Input Blue COM Brown PLC internal circuit PLC internal circuit Blue Input Brown COM . 3-wire OR connection for NPN output Example of AND (Series) and OR (Parallel) Connection AND connection for NPN output (Using relays) AND connection for NPN output (Performed with auto switches only) Auto switch 1 Auto switch 2 Load Brown Black Blue Brown Black Blue Auto switch 1 Brown Auto switch 2 Black Blue Load Brown Black Blue The indicator lights will light up when both auto switches are turned ON. Auto switch 1 Brown Auto switch 2 Black Blue Relay Relay Brown Black Blue Load Relay contact . 2-wire 2-wire with 2-switch AND connection 2-wire with 2-switch OR connection Auto switch 1 Auto switch 2 Brown Blue Brown Blue Auto switch 1 Auto switch 2 Brown Blue Brown Blue Load Load Load voltage at ON = Power supply voltage . Residual voltage x 2 pcs. = 24 V . 4 V x 2 pcs. = 16 V Example: Power supply is 24 VDC Internal voltage drop in auto switch is 4 V. Load voltage at OFF = Leakage current x 2 pcs. x Load impedance = 1 mA x 2 pcs. x 3 kΩ = 6 V Example: Load impedance is 3 kΩ. Leakage current from auto switch is 1 mA. When two auto switches are connected in series, a load may malfunction because the load voltage will decline when in the ON state. The indicator lights will light up when both of the auto switches are in the ON state. (Solid state auto switch) When two auto switches are connected in parallel, malfunction may occur because the load voltage will increase when in the OFF state. (Reed auto switch) Because there is no current leakage, the load voltage will not increase when turned OFF. However, depending on the number of auto switches in the ON state, the indicator lights may sometimes grow dim or not light up, due to the dispersion and reduction of the current flowing to the auto switches. 66 Series C55 Auto Switches Connection and Example