Rockwell Automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM User Manual
Page 385
Publication AG-UM008C-EN-P - February 2005
Sample Ladder Logic E-3
The following two rungs are the MSG control rungs - they should be replicated for further messages. Be sure to use the proper "Active Node Bit" from
S:67/0-S:82/14 for nodes 0 to 254 based on the Target Node Address in the MSG. This assures that messages will not be triggered to nodes that are
currently inactive (did not respond the last time they were polled by the Master). This "automatically" helps prevent unnecessary message retries to
non-communicating nodes.
0001
B3:0
1
Disable
MSG #1
EN
DN
ER
MSG
Read/Write Message
Type
Peer-To-Peer
Read/Write
Read
Target Device
500CPU
Local/Remote
Local
Control Block
N11:0
Control Block Length
14
Setup Screen
MSG
MSG #1 to Node #1
0002
N11:0
15
MSG #1
Enabled
N11:0
13
MSG #1
Done
N11:0
12
MSG #1
Error
B3:16
1
MSG #1
Finished
T4:0
DN
MSG
Delay
Done
S2:67
1
Node
#1
Active
U
N11:0
15
MSG #1
Enabled
0003
B3:0
2
Disable
MSG #2
EN
DN
ER
MSG
Read/Write Message
Type
Peer-To-Peer
Read/Write
Read
Target Device
500CPU
Local/Remote
Local
Control Block
N12:0
Control Block Length
14
Setup Screen
MSG
MSG #2 to Node #2
0004
N12:0
15
MSG #2
Enabled
N12:0
13
MSG #2
Done
N12:0
12
MSG #2
Error
B3:16
2
MSG #2
Finished
T4:0
DN
MSG
Delay
Done
S2:67
2
Node
#2
Active
U
N12:0
15
MSG #2
Enabled
0005
B3:0
3
Disable
MSG #3
EN
DN
ER
MSG
Read/Write Message
Type
Peer-To-Peer
Read/Write
Read
Target Device
500CPU
Local/Remote
Local
Control Block
N13:0
Control Block Length
14
Setup Screen
MSG
MSG #3 to Node #3