1. How to connect a PNP three-wire proximity switch to the input port of FX3U PLC.
Answer: The signal output termination of the PNP three-wire system near switch is connected to the input port of the PLC such as X0, the 0V end of the PNP type close switch to the 0V terminal on the PLC, and the S/S terminal is shorted with the 0V terminal, and the +24V end of the PNP type near switch is connected to the 24+ terminal on the PLC. If it is an external 24V power supply, then connect the signal output of the PNP three-wire system close switch to the input port of the PLC such as X0, the 0V end of the PNP type close switch to the negative of the external 24V power supply, and the S/S terminal and the negative short connection of the external 24V power supply, and the +24V end of the PNP type close switch to the positive of the external 24V power supply.
2. The scanning cycle of the PLC is fixed, so how do I know that the program I write exceeds the inherent scanning cycle, what is the way to know, and how to extend the scanning cycle?
A: If you want to know the current scan cycle, you can read it directly from the special register D8010 of the PLC; If there is a special memory in the PLC that can be used to set the stable scanning cycle, then it is necessary to set a specified value in this special memory to change the timing of the scanning cycle.
3. "MOV K0 K2Y0" means to reset Y0--Y7, so why does "MOV K1 K2Y0" not set Y0--Y7? And just a single Y0 set?
Answer: K2Y0 in the instruction is a combination of bit elements, representing Y0-Y7, MOV K0 K2Y0 instructions transmit 0 to K2Y0, the actual transmission is the binary number, the binary number of 0 is B 0000 0000, so it is to reset Y0-Y7, MOV K1 K2Y0 instruction is transmitted to 1 to K2Y0, the binary number of 1 is B 0000 0001, so it is set to 1 for Y0, not to set Y0-Y7.
4. Enter T1K20 in the ladder diagram to show what is going on with the incorrect setting of the soft components
Answer: If you enter T1K20 in the ladder diagram, it shows that the soft component settings are incorrect, because there is no space between T1 and K20, and the number of spaces is not specified, but at least 1 space is required. The correct input method is: OUT T1 K20, note that there should be a space between OUT and T1, T1 and K20, and be careful not to mix the letter O with the number 0 when entering the timer command.
5. For example, X001 controls T5, and the delay of T5 is 50S, does X001 need to be connected to 50S before T5 acts? Or is it just a matter of plugging it in?
Answer: X001 needs to be turned on for 50 seconds before T5 can operate. Because X001 is the driving condition of the timer, and T5 is a general-purpose timer, when the driving condition X001 is disconnected, the timer will reset and no longer time.
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