What are PLC Analog input and digital input

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         Digital signal input and output : The switch is closed , To break off .

         Analog input Output : It's just a number . such as ： level 1.5 rice , temperature 30 degree , Such a number .

         input unit

         The input unit is PLC The input interface connected to the controlled equipment , It's the signal coming in PLC The bridge , Its function is to receive the command element 、 Detect the signal from the element . The type of input is DC input 、 AC input 、 AC / DC input .

         output unit

         The output unit is also PLC Connecting parts with controlled equipment , What it does is it takes PLC The output signal is transmitted to the controlled device , That is, the weak current signal sent by the central processing unit is converted into a level signal , The actuator that drives the controlled device . The type of output is relay output 、 Transistor output 、 Crystal gate output .

         Extended data ：

        PLC working principle

         When the PLC is put into operation , Its working process is generally divided into three stages , Input sampling 、 User program execution and output refresh three stages . The completion of these three stages is called a scanning cycle . Throughout the run time , Programmable logic controller CPU Repeat the above three stages at a certain scanning speed .