PLC출력부 노이즈가 입력부에 미치는 영향에 관한 고찰

A Study on Input Effect by Output Noise Wave in PLC

In this paper described on back emf noise effect produced by relay coil(AC 220[V]) which connected output Programmable Logic Controller(PLC). The first method measuring is at the PLC nput terminal of noise waveform without source noise filter and output relay coil of surge killer. The Second measuring is at the PLC input terminal of noise waveform with source noise filter. The third, measuring noise waveform input be connected source noise filter and output relay coil of with surge killer. The amplitude of the first method noise waveform signal showed peak-peak ±25[V], second way showed peak-peak±10[V], and the third way showed peak-peak ±5[V].