Rockwell Automation 1771-IE,D17716.5.7 ANAL.INPUT MOD. - Manual (Page 39)

Single Channel Transfer for PLC Processor
Appendix B
BĆ2
The rungs within the conditional ignore zone (rungs 6-25) reconstruct and
store the 16-bit input word from each channel. The override condition of
the zone must be true (I/O scan counter accumulated value = 007) for the
state of any output within the zone to be changed.