Rockwell Automation 1772-LS_LSP,D17726.8.6 PROG/OPER MANUAL-MINI PLC-2/05 - Manual (Page 209)

Chapter
18
18-1
Programming Techniques
This chapter describes several programming techniques you can use for:
one-shot programming
automatic re-start
cascading timers
temperature conversions
program control
bottle filling application
The one-shot programming technique sets a bit for one program scan only.
There are two types of one-shots:
leading edge
trailing edge
Leading Edge OneĆShot
A leading edge one-shot sets a bit for one scan when its input condition has
made a false-to-true transition. The false-to-true transition represents the
leading edge of the input pulse (Figure 18.1).
Figure 18.1
Leading Edge One Shot
112
04
011
14
253
00
253
00
112
04
253
00
L
011
14
U
011
14
010
00
Chapter Objectives
OneĆShot