3-10
The OR Link operator links the current statement in Parallel with all previous
statements in an equation (see Figure 3-16).
Field 1 Field 2 Field 3 Field 4
[] [] [),5(] []
Field 1 Field 2 Field 3 Field 4
[25] [127] [),5(] []
Figure 3-16. An OR Link and a NOT Operator
In Figure 3-17, if the condition of 03-01 is Fire OR the condition of 03-02 is
NOT Fire then the INPUT SIDE is true. In order to cross from the INPUT SIDE
of the equation to the OUTPUT SIDE, the first or the second statement must be
true.
Note: The NOT gate is shown as a normally closed contact. This
statement is true because there is a path from the Input to the
Output.
18-02
Figure 3-17. An Example of How the NOT Operator Works In Parallel
Input Field 2, Continued
Using the OR and NOT
Operators
FIRST STATEMENT
SECOND STATEMENT
03-01
03-02
INPUT SIDE
(Statements 1 & 2)
OUTPUT SIDE
This statement is true because
03-01 is not in the FIRE
condition and 03-02 is not in
the FIRE condition.
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