PLC having two type of connection: Sink Type/ Sources Type:
Sink Type Connection:
Source Type:
PLC also required the sensor type same as above ans connection as below:
Sink Type Connection:
Sink Type Connection
The above connection check the all the output devices on end connected to the power supply +Ve site and PLC common connected to the -Ve/ 0Vdc supply.
Source Type Connection
The output device on terminal connected to the -Ve site of power supply and power supply +Ve side connected to the common of PLC card.
In Both the above connection scheme you see that both the connection are only difference the common point connection.PLC also required the sensor type same as above ans connection as below:
Sensor type for NPN & PNP
Most of the time PLC used as a PNP type of sensor because the output generated in +Ve supply.
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