In the process of understanding the button, the contact of the button is further understood.
Contacts are divided into: normally open and normally closed
More practical use are 1 normally open, 1 normally closed, 2 normally open, 2 normally closed, 3 normally open, 3 normally closed, 1 normally open 1 normally closed and so on. This is mainly related to the number of modules.
What is normally open and normally closed?
Normally open, normally closed contact: refers to a contact that is in a disconnected state under normal conditions (not energized).
That is, the normally open contact cannot be energized when the switch is not closed, and the normally closed contact can be energized. When the switch is closed, the opposite is true.
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