Rockwell-automation FactoryTalk View Machine Edition Users Guide Instrukcja Użytkownika Pobierz pdf (Strona 494)

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FACTORYTALK VIEW MACHINE EDITION USER’S GUIDE

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If-then-else

If-then-else expressions carry out an action conditionally or branch actions depending on

the statements in the expression. The if-then-else statements enable the expression to

perform different actions in different situations and to repeat activities until a condition

changes.

To build conditional expressions, use the relational operators and the logical operators for

the statement and values.

The if-then-else structure is:

if statement then value1 else value2

If the statement is true then the expression returns value1; if the statement is false then the

expression returns value2. If the result of the statement is a non-zero value, the statement

is true (and returns value1); if the result is 0, the statement is false (and returns value2).

The if-then-else structure is illustrated here.

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