Example #1 - Ladder Logic Program - Rockwell Automation SMC Dialog Plus User Manual

First Rung: When the Machine START push button is pressed, the SLC sends a START command to the SMC Dialog Plus controller. The SMC Dialog
Plus controller will start if no STOP command is being issued by the SLC or any other control device. (The start button is a normally open contact in this
example.)
Machine
START
Push Button
: 1.8
0
Second Rung: When the Machine STOP push button is pressed, the SLC sends a STOP command to the SMC Dialog Plus controller. (The stop
button is a normally closed contact in this example.) The branch provides a logic latched" circuit which exerts the STOP command until the feedback
from the SMC Dialog Plus controller indicates that it has received the command and has responded appropriately.
Machine
STOP
Push Button
: 1.8
1
SMC
STOP
Command
: 1.16
0
Third Rung: The SMC Dialog Plus controller's Current Phase A value returned by the analog feedback word (I:1.17 in this example) is moved every
scan to integer file 7, element 2.

Example #1 - Ladder Logic Program

SMC
Running
Bit
: 1.16
1
Serial Communications
MOV
MOVE
Source: I:1.17
Dest:
N7:2
8-9
SMC
START
Command
: 1.16
1
SMC
STOP
Command
: 1.16
0