Rockwell Automation 2706 DL20 SERIES G USER MANUAL - Manual (Page 161)

Appendix G
Application Notes
G–9
The PLC-5 processor configuration used for both examples is listed below.
This configuration may vary for different applications.
1. An Allen-Bradley 1784-T45 Industrial Computer is used.
2. The Data Monitor command is used to configure the sequencer table.
3. Two output modules in Rack 0, module group 0 (O:000).
4. The DL20 is defined as follows:
•
high true logic
•
binary message/variable data
•
time driven
•
DC inputs
•
scan = 4, debounce = 1
Figure G.3 illustrates how individual inputs can trigger unique corresponding
messages. If two or more inputs are true at the same time, the rung closest to
the end of the ladder diagram has priority and only that message is triggered
during this program scan.
Figure G.3
Triggering Messages Using Individual Inputs (PLC-5)
CPT
CPT
CPT
COMPUTE
Dest:
0:001
12298
Expression
N7:2
COMPUTE
Dest
0:001
12298
Expression
N7:1
COMPUTE
Dest
O:001
1298
Expression
N7:0
Rung 1
Rung 2
Rung 3
Rung 4
CPT
COMPUTE
Dest:
0:001
12298
Expression
N7:3
B3
1
B3
2
3
B3
PLC-5 Programming
Examples