Rockwell Automation 999 IMC S Class Compact Motion Controller (Cat. No. 4100-999-122) - Manual (Page 53)

Installation and Hookup 4-11
Publication 999-122 - January 1997
Select the Registration Input Voltage
Each axis of the IMC-S/23x may be individually configured to interface
directly with either 5V or 24V DC registration sensors via switches on
the motion controller module. SW2 on the main board selects the
registration input voltage for axes 0 and 1, and SW1 on the expander
board selects the registration input voltage for axes 2 and 3. The
IMC-S/23x is shipped from the factory configured for 24V registration
sensors for all axes (all switches up), as shown below.
To use 5V registration sensors with any axis, carefully move the
appropriate switch to its down position using a pen, small screwdriver,
etc. For example, the figure below shows axis 1 configured for 24V
registration sensors and all other axes configured for 5V sensors.