PLC input module ( FX1N series PLC, for example)

Figure 2 - 3 is FXlN series dc input circuit and internal circuit diagram. The dotted box is PLC controller external NPN transistors open collector output of electronic sensors ( Such as proximity switch) The schematic diagram. Figure 2 - 4 is extension module FX2N - 48 er - UAl/UL ac input circuit diagram. As figure 2 - 3 in the contact point on or outside the NPN transistor saturation conduction in this picture, the electricity flows through the positive (of the 24 v power supply 24 v terminal) , S/S terminal, internal circuit, X0, inputs and external contacts or transistor, from 0 v terminal flow back to the cathode of 24 v power supply, two against fang in the optical coupler of a bright light emitting diode, light activated triode saturated conductivity, the CPU reads in the input stage is the number 1; NPN transistors are in a state of cut-off, optical coupler in light-emitting diodes, light activated triode cut-off, CPU reads in the input stage is 0. As figure 2 - 4 outside the contact point on, or the PNP transistor saturation conduction, electricity flows through the positive (of the 24 v power supply 24 v terminal) , external contact or transistors, X0 inputs, such as the internal circuit and S/S terminals, terminal from 0 v flow back to the cathode of 24 v power supply, make leds light in optical coupler, light activated triode saturation conduction. In the input circuit has a RC filter circuit, in order to prevent caused by input contact jitter or external disturbance pulse error of the input signal. Filter circuit delay time of typical values for 10 to 20 ms ( Signal rise along) And 20 ~ 50 ms ( Falling edge signal) About 5 ~ 10 ma, input current.
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Coolmay provides a number of plc controller price designed to handle programmable control systems.