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Rockwell Automation Publication 1789-UM002K-EN-P - January 2015
Appendix B
Communicate with Devices on a ControlNet Network
Send a MSG Instruction
To send an MSG from Soft1 to Soft2, follow these steps.
1.
For Soft1, create a controller-scoped tag and choose the Message data type.
2.
Enter an MSG instruction.
In this example logic, a message is sent when a specific condition is met.
When count_send is set, send count_msg.
3.
Configure the MSG instruction on the Configuration tab.
4.
On the Communication tab, specify the communication path.
A communication path requires pairs of numbers. The first number in the
pair identifies the port from which the message exits. The second number
in the pair designates the node address of the next device.
count_send
/
count_msg.en
EN
DN
ER
Type - Unconfigured
Message Control
count_msg ...
MSG
For this item
Specify
Message Type
CIP Data Table Read or
CIP Data Table Write
Source Tag
Tag containing the data to be transferred
Number of Elements
Number of array elements to transfer
Destination Tag
Tag to which the data will be transferred
Item
Specify
Communication Path
(each SoftLogix controller resides in its own
computer)
1,2,2,27,1,5
Where:
1 is the SoftLogix backplane of Soft1
2 is 1784-PCICS card in slot 2
2 is the ControlNet port
27 is the ControlNet node of Soft2
1 is the SoftLogix backplane of Soft2
5 is the controller slot of Soft2
Communication Path
(each SoftLogix controller resides in the
same computer)
1,5
Where:
1 is the SoftLogix backplane of Soft1
5 is the controller slot of Soft2
IMPORTANT
Ladder-triggered messages use the unscheduled portion of ControlNet
bandwidth and will work without rescheduling the network.
