Rockwell Automation FactoryTalk View Site Edition Users Guide - Manual (Page 566)

F ACTORY T ALK V IEW S ITE E DITION U SER ’ S G UIDE
20–20
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If the statement is true then the expression returns value1; if the statement is false then the
expression returns value2. Keep in mind that the statement is a mathematical equation and
true means a non-zero value, and false means zero.
Following is an illustration of the if–then–else structure:
Nested if-then-else
It is common to nest an if-then-else structure inside the then or else part of an if-then-
else structure.
Example 1: Nested if -then- else
This expression:
If statement1 Then value1
Else if statement2 Then value2
Else value3
is interpreted in this way:
value2 value1
enter
statement
exit
true
false