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How close to the switch and PLC DI how to connect? - - - - - -
2) Need in series circuit using 3) Equivalent to an ordinary switch, have a positive negative 2, three-wire system proximity switch ( 1) Three wire 2) Requires a separate power supply to work 3) Output all the way, two output forms: NPN/PNP 3, four wire proximity switch ( 1) Four wire 2) Requires a separate power supply to work 3) Two lines of output, NC/NO 4) Output format: NPN/PNP we simply introduced the above three kinds of proximity switch, so in the practical application of proximity switch how to connect to PLC digital input? Below we to d UN 214 - one hundred million 1 bd23 - 0 xb8 CPU for example. 1, two wire close to switch, and the UN - 214 1 bd23 - 0 xb8 DI connection 2, three-wire system NPN proximity switch and the UN - 214 1 bd23 - 0 xb8 DI connection 3, three-wire system PNP proximity switch and the UN - 214 1 bd23 - 0 xb8 DI connection
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