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AVEVA™ Process Simulation

Operators for custom messages

  • Last UpdatedSep 10, 2025
  • 2 minute read

You can use a limited number of operators in the logical statements for custom messages.

The following table lists the relational operators that you can use in the logical statements. Each logical statement must include at least one relational operator, except in cases that involve variable attributes or text strings that resolve to a true or false value. See Examples and limitations of logical statements for custom messages for more information.

Operator

Description

==

=

The values on either side of the operator must be equal.

<>

The values on either side of the operator must not be equal.

<

The first value must be less than the second value.

>

The first value must be greater than the second value.

<=

The first value must be less than or equal to the second value.

>=

The first value must be greater than or equal to the second value.

The following table lists the logical operators that you can use in the logical statements. They must appear between two independent relational statements. Note that these operators are not case sensitive.

Operator

Description

AND

&&

Both the first relational statement and the second relational statement must be true.

NOT

The relational statement must be false.

OR

||

Either the first relational statement or the second relational statement must be true.

Currently, you cannot use mathematical operators in the logical statements.

In addition to the operators, you can append a variable name with .calculated to return a true or false value based on the calculated status of that variable. Similarly, you can append a variable name with .specified to return a true or false value based on the specified status of that variable. In these cases, you may not need to include a relational operator in your logical statement.

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