Technical Reference Manual - InduSoft

Appendix: Built-in Scripting Language
Logical functions
These functions are used to perform logical operations (e.g., if/then, true/false) on tags and expressions.
False
Determines whether the specified tag or expression is logically false.
Function Group Execution Windows Embedded Thin Client
False Logical Synchronous Supported Supported Supported
Syntax
False(TagOrExpression)
TagOrExpression
Tag or expression to be used in the function.
Returned value
0 If the tag or expression is not logically false.
1 If the tag or expression is logically false.
Tip: You may find this function useful if you need to return an actual value of 0 when the
expression returns some value other than 0.
Examples
If
Tag Name
Expression
Tag False( 1 ) // Returned value = 0
Tag False( 5 < 2 ) // Returned value = 1
Determines whether the contents of numExpression are logically true, then returns the value of numThen or
optNumElse accordingly.
Function Group Execution Windows Embedded Thin Client
If Logical Synchronous Supported Supported Supported
Syntax
If( numExpression, numThen, optNumElse )
numExpression
Tag or expression used as the condition in the function.
numThen
Tag or expression used if the condition is logically true.
optNumElse
Optional tag or expression used if the condition is logically false.
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