Auto-Erasing Blocks with Datalinks in AutoCAD

Designer provides an 'Auto-Erase' (or auto-delete) function where a block will be automatically erased from a drawing if a specific DataLink returns nothing. If a DataLink attribute is prefixed with <DEL> and AVEVA Instrumentation detects that the following DataLink has no value, then Designer will erase the block containing the <DEL> Datalink.

For example, it is required to erase a block if there is no tag number for {TAG10}. Entering: <DEL>{TAG10} in for an attribute in a block will tell AVEVA Instrumentation to erase the block if {TAG10} evaluates to nothing (i.e. there is no TAG10 for this drawing).