IN THE QUICKCLIENT MY TAGS ARE SHOWN AS GOOD BUT IN THE DESIGNER THEY ARE SHOWN AS BAD AND THE VALUE BECOMES NULL.
why does that happen?
{ Please don’t shout. }
The most common reason is an OPC server that doesn’t support subscriptions properly. Setting the tag group to OPC reads instead of subscribing is a work-around. (Better to fix the OPC server if possible, though.)