Ensure PLC analog input modules work

We know, PLC analog input module in order to prevent interference generated by the external circuit (e.g., voltage spikes, the interference noise, etc.) caused by abnormal operation of the PLC plc sequence of events recording module‍ a damaged components, generally in the PLC input side plc industrial controller‍ are used to cut off the PLC Contact the internal circuit and external electrical circuit to ensure the normal operation of the PLC. And in the input line has a RC filter circuit to prevent false signals due to the input jitter or pulse caused by external interference.