In the general PLC control system, the signal collected by the analog amount due to the impact of the field environment, etc., can not fully reflect the real situation on the scene. After the signal enters the system, it is easy to cause an operation error, and it is more likely to cause system control errors. Caused various accidents. It can be seen that the success of analog control greatly determines the quality of the controllable control system. General filter control is simply the average processing of several sampling values, sometimes causing large deviations, and debugging is very inflexible. This article aims at the actual situation in the rolling field. This paper introduces a set of sampling and filtering methods of analog signal for rolling line PLC control. The free and flexible signal processing is realized.
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