Tags names are flexible and to not have to match data source names (like an OPC path) or tag codes (such as N7, F8, etc.). It is not necessary that Tag's name be related at all to its underlying data source (OPC path, for instance). This provides a level of indirection that is convenient for systems with many repeat Tag structures.
It is important to give Tags a meaningful structure and arrange them in hierarchical Tag folders so that they are easy to understand, identify, and locate for all developers. By default, Ignition Tags are named after their OPC Server address when a Tag is dragged into the Tag Browser. You can change this name to just about anything that you want. We recommend using names that mean something to your process, such as "Motor 3 Amps." Alternatively you could create folders in your Tag Browser such as "Motor 3/Amps.". When renaming Tags and folders, there is really only one question to ask: "does this structure make sense?"
Another important concept to consider when naming and organizing your Tags, is to do this early in your project. If you rename or move any of your Tags to another folder, and your Tag is being used in other places, chances are you are going to break the reference to the Tag on your screen. So keeping your Tags organized and defining your Tag structure early on in your project is critical.
When you choose a new name for your Tags and folders, there are some rules that must be followed. The first character of the Tag name must be one of the following:
- Any alphanumeric
- Any valid unicode letter
- An underscore
The second character, and every character after that can then be one of the following:
All other special characters can not be used in a Tag name.