Rockwell Automation 1746-HSTP1 Stepper Controller Module/ User Manual - Manual (Page 67)

Publication 999-121 - December 1999
6-4 Application Examples
Entering Negative Position Data
The position data is sign magnitude. There are three ways to easily
assign a negative number:
• Using the ladder
• Manipulating the bits manually
• Calculating manually
To enter negative position data using the ladder:
1. Divide the absolute value into most (MSW) and least significant
(LSW) words.
2. Use bitwise “inclusive or” with MSW and 32768.
3. Place the result in the position MSW, LSW.