Rockwell Automation 1747-SN Remote I/O Scanner - Manual (Page 123)

Publication 1747-UM013B-EN-P - January 2005
M0 - M1 Files and G Files B-11
3. Click “Edit G Data” to access the setup screen for the module.
Figure 2.3 Scanner G File Configuration Options
Once you understand how the modules map Remote I/O
locations, this menu is used to set up the Scanner. First select a
group number in a logical rack. Then select the type of
addressing for that group, either ¼ rack, ½ rack ¾ rack of full
rack.