Backing tag usages that can cause unexpected operation

Writing to, sharing, or referencing backing tags can cause unexpected operation, including controller assert or a Major Non-Recoverable Fault. These examples show incorrect usages. Rockwell Automation advises you to avoid these configurations in your Logix Designer projects.

Writing to backing tag members

Improper configuration	Proper configuration

Sharing backing tags by multiple instruction invocations

Improper configuration	Proper configuration

Passing backing tag members as parameters to an instruction controlled by the same backing tag

Improper configuration	Proper configuration

Referencing the backing tag .EnableIn member anywhere in the program

Improper configuration	Proper configuration