Successively proceeding with various operations in accordance with a predetermined order is called sequence control. With sequence control, the various operations when machines and devices are used, and their order of operation and execution conditions are stored in advance to the control device (controller). By doing this, the series of target operations such as “start” and “stop” or “open” and “close” can be performed according to the state or condition of the machine or device to be controlled.
Let’s take a look at an actual example of sequence control of how a fully automatic washing machine works.
In this condition, after putting the cloths and you just need to press start button on the washing machine. The washing machine will automatically operate according to a predetermined order. The PLC is used as the controller for performing sequence control. We just need to preprogram the sequence control into the PLC so that it can operate automatically.
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