Rockwell Automation 1775-S4B,D17756.5.3 User Manual SCANNER/MSG HND - Manual (Page 140)

Using a Peripheral Communication Module
Appendix A
AĆ6
Bit shift right shifts a 0 into the left most bit.
Thus, the sign on the value could change due to a shift operation. An
example is given below:
The following command lines show a bit shift execution that changes the
sign on a value:
A = -1
B = (A>>1)
P A
P B
The peripheral communication module prints out the value -1 for user
symbol A and 2147483647 for user symbol B which is a bit shift operation
on user symbol A.
The bit patterns for the two values are given below:
User Symbol Value Stored Bit Pattern (32Ćbits)
A
B Ć1
2147483647 11... 11111111
01... 11111111