Preface
MicroLogix 1000 Programmable Controllers User Manual
8–14
Math Instructions in the Paper Drilling Machine
Application Example
This section provides ladder rungs to demonstrate the use of math instructions. The
rungs are part of the paper drilling machine application example described in
appendix E. You will be adding to the subroutine in file 7 that was started in
chapter 7.
Rung 7:1
Resets the number of 1/4 in. increments and the 1/4 in. thousands when
the ”drill change reset” keyswitch is energized. This should occur
following each drill bit change.
| drill change 1/4 in. |
| reset keyswitch Thousands |
| I:0 +CLR–––––––––––––––+ |
|––––] [––––––––––––––––––––––––––––––––––––+–+CLEAR +–+–|
| 8 | |Dest N7:11| | |
| | | 0| | |
| | +––––––––––––––––––+ | |
| | 1/4 in. | |
| | increments | |
| | | |
| | +CLR–––––––––––––––+ | |
| +–+CLEAR +–+ |
| |Dest N7:10| |
| | 0| |
| +––––––––––––––––––+ |
Rung 7:5
➀
Keeps a running total of how many inches of paper have been drilled
with the current drill bit. Every time a hole is drilled, the
thickness (in 1/4 ins) is added to the running total (kept in 1/4
ins). The OSR is necessary because the ADD executes every time the
rung is true, and the drill body would actuate the DRILL DEPTH limit
switch for more than 1 program scan. Integer N7:12 is the
integer-converted value of the BCD thumbwheel on inputs I:0/11 –
I:0/14.
| Drill |Drill Wear 1/4 in. |
| Depth LS | OSR 1 increments |
| |
| I:0 B3 +ADD–––––––––––––––+ |
|––––] [–––––––[OSR]––––––––––––––––––––––––––––+ADD +–|
| 4 24 |Source A N7:12| |
| | 0| |
| |Source B N7:10| |
| | 0| |
| |Dest N7:10| |
| | 0| |
| +––––––––––––––––––+ |
➀
Rungs 7:2 through 7:4 are added at the end of Chapter 9.
Programming
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