An analog or digital tag can stand alone as an expression or be included as part of an expression that is made up of other components as well, such as constants, operators, functions, and If-Then-Else logic. An expression that is simply a tag name returns the current value of the tag.
You can use string tags as operands with the plus (+) arithmetic operator and with relational operators.
When you use a tag name that contains dashes (-) or starts with a number, you must enclose it in curly brackets in the expressions to distinguish the tag name from other elements in the expression.
Example: tag1 == tag2 + {tag-3}
Quick reference to math functions