1, power interference: the fluctuation of power supply and the power supply voltage in the high harmonic interference. <br>2, the interference of the induction voltage: the plc around the adjacent large-capacity equipment start-up and stop, due to electromagnetic induction caused by interference; <br>3, external wiring interference: due to a variety of cable selection is unreasonable, signal line insulation is reduced, installation, wiring and other unreasonable interference.
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