Must first thoroughly understand the characteristics of NPN and PNP output
1, NPN drain type output, that is, between the output terminal OUT OV and voltage modulation, the active low wiring suitable for the purposes of the PLC.
2, PNP is the output of the "source" is the transition between the output power and voltage of the output terminal OUT of the PLC is suitable for high level wiring.
PLC wiring two types: high involvement and low level intervention. The S7-200. May also be used with a high effective method of low effective method.
1, If a DC power supply OV and 1M, 2M, is effective high.
2, If the DC power supply 24V is connected to the 1M, 2M, is low effective manner.
1, NPN drain type output, that is, between the output terminal OUT OV and voltage modulation, the active low wiring suitable for the purposes of the PLC.
2, PNP is the output of the "source" is the transition between the output power and voltage of the output terminal OUT of the PLC is suitable for high level wiring.
PLC wiring two types: high involvement and low level intervention. The S7-200. May also be used with a high effective method of low effective method.
1, If a DC power supply OV and 1M, 2M, is effective high.
2, If the DC power supply 24V is connected to the 1M, 2M, is low effective manner.
