Tag Name Syntax

Plant SCADA tags (variable tags, alarm tags and trend tags) need to use the following syntax:

• The fields are not case sensitive.

• They need to begin with either an alphabetical character (A-Z or a-z) or an underscore (_).

• Subsequent characters need to be alphanumeric (A-Z, a-z, 0-9), backslashes (\), or underscores (_).

The use of any other characters will result in a compile error message.

For example:

• "_MyTag123" and "my\New\Tag" are both valid tag names.

• "\NewTag\" is invalid.

Tag names that begin with a numeric character, such as '12TagName', are only valid if the INI parameter [General]TagStartDigit is set to 1 (the default value is zero).

Note: In the case of alarms, the Alarm Tag property needs to follow this syntax, but the Alarm Name property does not.

See Also

Structured Tag Names

Reserved Words