8-13
AND (first) & OR (second)
In Figure 8-10 the first and second statements are linked in Series and the third
statement is linked in Parallel with the first and second statements. Remember, a
Link operator links that statement with all previous statements, not just the
statement before it.
[ ] [ ] [FIRE] [3-01]
[AND] [ ] [FIRE] [3-02]
[OR] [ ] [FIRE] [3-03]
Figure 8-10
In Figure 8-10, IF the condition of 3-01 is Fire AND the condition of 3-02 is
Fire, OR the condition of 3-03 is Fire, then the INPUT SIDE is true. Another
way to look at this equation is shown in Figure 8-11. In order to cross from the
INPUT SIDE of the equation to the OUTPUT SIDE, the first and second
statements (together) or the third statement must be true.
18-01
18-03
18-02
Figure 8-11
Continued on next page
Custom Control Programming, Continued
Field 1 (continued)
Points 3-01 and 3-02 (in Series)
are Parallel with 3-03.
3-01 & 3-02 must be true
(together) or 3-03 must be true
in order to go from the INPUT
to the OUTPUT.
3-01
Field 1
3-02
Field 2
3-03
Field 3
OUTPUT SIDE
Field 4
INPUT SIDE
(Statements 1,2, & 3)
FIRST
STATEMENT
SECOND
STATEMENT
THIRD
STATEMENT
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