The interference that affects the PLC control system is the same as the interference source that generally affects industrial control equipment. Most of them are generated in the parts where the current or voltage changes drastically. The parts where these charges move violently are the noise source, that is, the interference source.
The type of interference is usually divided according to the cause of the interference, the interference pattern of the noise, and the waveform nature of the noise. Among them: according to the different causes of noise, it is divided into discharge noise and sporadic noise. According to the different sound interference modes, it is divided into common mode interference and differential mode interference. It is a more commonly used classification method. Common-mode interference is the potential difference between the signal and the ground, which is mainly caused by the series connection of the grid. The ground potential difference and the common-mode voltage induced by the space electromagnetic radiation on the signal line are formed. The common mode voltage is sometimes large, especially in the electrical Power Supply room with poor isolation performance. The common mode voltage of the transmitter output signal is generally high, and some can be as high as 130V or more. The common-mode voltage can be converted into a common-mode voltage through an asymmetric circuit, which directly affects the measurement and control signals and causes component damage. This common-mode interference can be DC or AC. Common mode interference refers to the interference voltage used between the two levels of the signal, which is mainly caused by the coupling induction of the space electromagnetic field between the signals and the common mode interference converted by the unbalanced circuit. This kind of voltage is directly superimposed on the signal and directly affects the measurement. With control accuracy.
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