48 Rockwell Automation Publication 5069-UM003B-EN-P - January 2020
Chapter 3 Compact 5000 I/O Serial Module Features
3. Verify that DF1 Master is selected under channel one. Configure Channel 
1 to DF1 Master if it is not configured to DF1 Master. 
4. Click Channel 1 and configure the parameters as necessary.
5. Click DF1 Master and configure the parameters as necessary.
6. Click General in Module properties.