Rockwell Automation 1771-IS 5V DC INPUT MOD - Manual (Page 31)

Programming and Operation
Chapter 3
3-12
Momentary Contact Mode
When 3-digit BCD thumbwheel switches are wired according to the block
diagram in Figure 3.7a, the switch settings are stored automatically in the
data table after a block transfer, as shown in Figure 3.7b. The first word
is reserved for diagnostic data. The remaining words store the three digits
of the thumbwheel setting. The digits MSD, MD and LSD have been
loaded in the order are shown in Figure 3.7. For example, observe how
the 3-digit switch setting 642 of switch #3 is loaded into the data table
(Figure 3.7b).