Rockwell Automation 1715-OF8I Redundant I/O System User Manual - Manual (Page 239)

Rockwell Automation Publication 1715-UM001C-EN-P - March 2014 239
Using SIL 2 Add-On Instructions with 1715 Redundant I/O Modules Chapter 7
The tag can be controller- or program-scoped.
7. Choose the module-defined output tag.
If you have more than one module, be sure to choose the output tag for the
appropriate module.