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Have you ever noticed that why in emergency pushbuttons and stop pushbuttons we always use Normally Closed contacts? Or do you know what is the best solution for being aware of damage in a level switch cable? In a previous video we have written a PLC program for this process and we have considered all the level switch sensors as Normally Open ones But in the real-world conditions when we are choosing the instrument switches or other types of discrete equipment for a process we have to select which one should be exactly a Normally Open sensor and which one should be a Normally Closed sensor In this video, well answer these questions and investigate the real-world application examples of Normally Open and Normally Closed Contacts So, if you are interested watch the rest of this video Generally speaking there are three types of digital or discrete signals in the industry First, the Instrument Switches like Level switches Flow switches, and so on Second, Operator Pushbuttons like Start a
