When the bit is equal to 1, the normally open contact
is closed, and the normally closed contact is
disconnected.
When the bit is equal to 0, the normally open contact
is disconnected , and the normally closed contact is
closed .
In STL, the normally open contact is represented by
“LD”, "And" and "Or" instructions.
In STL, normally closed contacts are represented by
"NOT", "NOT AND" and "NOT OR" instructions.
Example:
75
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