Expressions, tag names, and scripts

When expressions, tag names, and scripts are required, they cannot be empty text, or text that is only blanks. If these text items are not formulated correctly; the expression, tag name, or script do not parse correctly and result in an error.

In the case of tag names, the tag type must match the type expected for an object. In most cases, it is possible to use dotfields to access tag properties. For example, the second bit of an integer tag iTag005 can be accessed as:

iTag005.02

In this case, the tag and dotfield evaluates to a discrete value and can be used where a discrete tag name is required, whereas the iTag005 alone would result in an error.