About Tags and the Project Database Naming the Tag Observe the following guidelines when you name a tag or class member: • Each name must be unique — you cannot specify the same name as another user-created tag or class member, an imported tag, a system tag, or a built-in function. If you enter an existing name, the project development environment will recognize that name and it will not prompt you to create a new tag. • The name can be composed of uppercase and lowercase letters ( A–Z , a–z ), the accented forms of those letters (e.g., й , ь , з ), standard numerals ( 0–9 ), and the underscore character ( _ ).
All other punctuation, special characters, mathematical symbols, and non-Latin alphabets are not allowed. • The name must begin with a letter. • The name can be up to 255 characters long. • Even though the name can be composed of both uppercase and lowercase letters, it is not actually case- sensitive. It will be recognized as long as it is spelled correctly. Therefore, you can use uppercase and lowercase letters to make the name more readable to you. For example, TankLevel and tanklevel both refer to the same tag. Tip: To indicate a tag will be used as an indirect tag , insert the "at" sign ( @ ) at the beginning of the tag name. Page 48