1. Why are NEMA symbols such as pushbuttons, float switches, and limit switches not used in...

Question

1. Why are NEMA symbols such as pushbuttons, float switches, and limit switches not used in programmable logic controller schematics?

2. How are such components as coils and contacts identified and distinguished from others in a PLC schematic?

David · Accepted Answer

Solution: 
There are no NEMA symbols for push button, float switch, limit switches, etc. The PLC recognizes only open or 
closed contacts. It does not know if a contact is connected to a push button, a limit switch, or a float switch. Each 
contact, however, does have a number.

1. Why are NEMA symbols such as pushbuttons, float switches, and limit switches not used in programmable logic controller schematics? 2. How are such components as coils and contacts identified and...

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