Rockwell Automation Publication 750-RM003A-EN-P - April 2018 65
Selection Considerations Chapter 1
PowerFlex 755TM Bus Supply I/O Option Modules
The main control board has one digital input that is typically used for
hardware ENABLE. Optional 750-Series I/O modules must be added if
additional digital and analog I/O is required. See publication 750-IN100
for
detailed information about option modules.