Every few weeks we will encounter a folder of tags that will go bad. The only way that I have found to solve the problem is to reset the Allen Bradley driver that we are using. Are you guys aware of this problem, or have a fix for it?
What device types is it happening with? (ControlLogix, CompactLogix, MicroLogix, SLC or PLC-5)
What version of Ignition are you using?
Are you connecting directly to a SLC5/05, through DH+ or ControlNet via a gateway, or through a device like a NET-ENI?