Normally open (NC) contact concept.
This is PLC
Program for NC contact.
Normally closed contact is known as NC contact. When
the quantity has signal state 0, the NC contact allow signal flow and output
result is 1.
When the quantity has signal state 1, the closed
contact is not activated and therefore output state is zero.
If two NC contacts are connected in series, the
power flows once all contacts have zero signal state.
If two NC contacts are connected in parallel
connection, the power flows when one NC contact amongst all have zero signal
state.
Example
of the NC contacts.
In above example two NC
contact are connected in series (tag 1 and tag 3). When both signal state are
zero, output result is 1.
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