Invalid items handling

Item syntax verification is based on the type of controllers associated with it. The PLC-5 and SLC500 controllers have predefined syntax on their item names. When an item is specified for these two types of controllers, its item syntax will be verified immediately. If the item syntax is incorrect, the item is rejected immediately and will not be added to the Communication Driver does periodically send messages to the Logix5000 controller for tag database update. The item that has a BAD syntax will be re-evaluated when a new tag database has been downloaded to the Logix5000 controller. If the item is subsequently matched to an item in the new tag database, the item will automatically switch to a GOOD quality with the proper data value.Communication Driver