Rockwell Automation 1771-IE,D17716.5.7 ANAL.INPUT MOD. - Manual (Page 37)

Block Transfer (Multiple GET) for PLC-2/20
Appendix A
AĆ4
Rungs 11 Ć 18
These rungs move data from the BTR read file to storage. When the
block transfer one-shot (02002) is set, data in each (buffer) word address
050-057 is moved to storage location 150-157 where it can be used by
your ladder program. If data is not moved, it is written over by the next
block transfer.
Important: Each input word contains an overflow- underflow bit (bit 17)
that your program should monitor to be sure the value stored in that word
is within range. The module sets this bit when it detects data at or beyond
the limits of 0 and 255. We leave this programming logic to you because
it is application dependent.
Last Rung
These GET instructions display the BCD value of each transferred word,
and are for display only.