3-5
Field 1 is always empty in the first statement of any Custom Control equation.
In subsequent statements, Field 1 will contain one of the two Link operators:
• AND – which links the statement in “Series” with all previous statements
• OR – which links the statement in “Parallel” with all previous statements
The AND Link operator links the current statement in Series with all previous
statements in an equation (see Figure 3-6).
Field 1 Field 2 Field 3 Field 4
[] [] [),5(] []
Field 1 Field 2 Field 3 Field 4
[$1'] [] [),5(] []
Figure 3-6. The AND Link
In Figure 3-6, IF the condition of 03-01 is Fire AND the condition of 03-02 is
Fire, then the INPUT SIDE is true. Another way to look at this equation is
shown in Figure 3-7. In order to cross from the INPUT SIDE of the equation to
the OUTPUT SIDE, both of the statements must be true.
18-01 18-02
Figure 3-7. An Example of How the AND Link Works
Continued on next page
Input Field 1
Input Field 1
The AND Link Operator
INPUT SIDE
(Statements 1 & 2)
Points 03-01 and
03-02 in Series.
Both statements
must be true in
order to go from
the INPUT to the
OUTPUT.
OUTPUT SIDE
03-01 03-02
FIRST STATEMENT
SECOND STATEMENT
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