Figure 2 DC input circuit Figure 3 AC input circuit Figure 4 leakage input circuit Figure 5 common anode circuit Figure 6 common cathode circuit Figure 7 hybrid circuit 10 NPN open collector output and PLC connection Figure 11 PNP open collector output and PLC connection 4 Conclusion Due to the diversity of the PLC input module circuit form and the external sensor output signal, we must fully understand the type of PLC input circuit and the form of the sensor output signal before wiring the PLC input module. Only in this way can the PLC input module be correctly wired. , to lay a good foundation for the subsequent plc programming and debugging work.
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