PLC control system in the design, although the proportion of the work of wiring smaller, most of the work of the PLC programming or design work, but it is the basis of Programming, as long as the wiring correctly, can be programmed to smooth the design work. Wiring work and guarantee the correctness, it is necessary to the PLC within the input and output circuits have a clear understanding.
We know that, PLC digital input module in order to prevent interference from outside lines (such as voltage spikes, noise interference, etc.) from the PLC work even non-normal components of the damage is, in general the input side PLC Optocoupler used to cut off the PLC Internal and external lines of electrical lines on the links, and ensure the normal operation of PLC. And the input line are provided in the RC filter circuit to prevent the importation of points Pulsed jitter or external interference caused by the wrong signal.
PLC input circuit, according to the type of external power supply, can be divided into DC and AC input circuit input circuit; PLC by the public-input module (COM side) of the current flow of points, can be divided into the source input circuit and input leakage circuit; according to Optocoupler LED public side of the connection can be divided into a total of anode and cathode input circuit.
温馨提示:答案为网友推荐,仅供参考