Normally open (NO) contact concept.
This is PLC
Program for NO contact.
Normally open contact is known as NO contact. When
the quantity has signal state 1, the open contact closes and therefore the
signal state of the output is changed.
When the quantity has signal state zero, the open
contact closes is not activated and therefore output state is zero.
If two NO contacts are connected in series, the
power flows once all contacts are closed
If two NO contacts are connected in parallel
connection, the power flows once one contact amongst all contacts are closed.
Example
of the NO contacts.
In above example two NO
contact s are connected in series (tag 1 and tag 3). When both signal state is
1 then tag 2 state is 1.
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