In the Communications > Network > Protocol 1 - AB Tag Names > PLC10 configuration page there is a Tag Names section (not the same as the separate Data Tags tab) and it has Manage, Import and Export buttons. Manage shows the same popup you get when you click on the "Pick..." button on a Data Tags Source. There is only an option to Create what it also calls tags. I see no way to delete them.
I did see that if you export the Tag Names and remove the lines for the tags you want to delete from the text file they will be deleted from the application BUT it reorders the internal pointers so Data Tags now have the wrong tag name.
Even if you go through the Data Tags and fix the source for the ones that changed, the ones that did not change still will not read that address from the PLC. The only way to get them to work again was to change all the Data Tags sources to something else and then back.
I did see that if you export the Tag Names and remove the lines for the tags you want to delete from the text file they will be deleted from the application BUT it reorders the internal pointers so Data Tags now have the wrong tag name.
Even if you go through the Data Tags and fix the source for the ones that changed, the ones that did not change still will not read that address from the PLC. The only way to get them to work again was to change all the Data Tags sources to something else and then back.