What is the influence of PLC control system interference sources

Influence of PLC controller control system interference from general influence industrial control equipment of interference sources, mostly produce dramatic change in the current or voltage parts, the parts of these intense mobile charge is noise source, namely the interference sources. Interference type usually according to the cause of interference, the interference of noise model and noise of the waveform of the different nature of division. Among them: according to the causes of noise is different, divided into discharge noise, surge, high-frequency oscillation noise, etc. ; According to the noise waveform, nature is different, divided into continuous noise and occasional noise, etc. ; According to the noise interference pattern is different, divided into common mode and differential mode. Common-mode interference and the differential-mode interference is a more commonly used classification method. Common-mode interference signals are on the ground potential difference, mainly by the grid series, epd and the space electromagnetic radiation on the signal induction of common mode ( Same direction) Formed by the voltage to add. Sometimes common-mode voltage is larger, especially the isolation the worse performance of electric power supply room, the generally high common-mode voltage of the output signal in the transmitter, some can be as high as more than 130 v. Common-mode voltage by asymmetric circuit can be converted into a differential mode voltage, a direct impact on measurement and control signals, damaged components ( This is some system I/O module the cause of the damage rate is higher) The common-mode interference can be used equally for dc, for communication. Differential mode interference is applied to the signal between the poles interfering voltage, mainly composed of space electromagnetic field in the signal coupling between induction and unbalanced by circuit switching voltage, which is formed by the common mode interference superimposed on the signal directly, this way, directly affect the precision of measurement and control.
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