10 Rockwell Automation Publication 5094-UM001C-EN-P - April 2019
Preface
Graphics Indicate 
Feature Support
Throughout this manual, graphics appear with section titles to indicate the 
digital I/O modules that support the feature that is described in that section.
If both standard and safety modules support a feature, you see icons for both 
types.
If only one type of module, standard or safety, supports a feature, you see only 
one type of icon.