Rockwell Automation RECOMM-ENET EtherNet/IP Communications Module - Manual (Page 75)

Using Explicit Messaging 7-3
Note: To display the Message Configuration dialog box in
RSLogix 5000, add a message instruction (MSG), create a new tag
for the message (properties: Base tag type, MESSAGE data type,
controller scope), and click the Configure button.
7.3 Performing Explicit Messages
There are five basic events in the Explicit Messaging process
defined below. The details of each step will vary depending on the
controller. Refer to the documentation for your controller.
Important: There must be a request message and a response
message for all Explicit Messages, whether you are
reading or writing data.
➍ Class
The class is an EtherNet/IP class. Refer to Appendix C, EtherNet/IP
Objects, for available classes.
➎ Instance
The instance is an instance (or object) of an EtherNet/IP class. Refer
to Appendix C, EtherNet/IP Objects, for available instances for each
class.
➏ Attribute
The attribute is a class or instance attribute. Refer to Appendix C,
Ethernet/IP Objects, for available attributes for each class or
instance.
➐ Source Element
This box contains the name of the tag for any service data to be sent
from the scanner or bridge to the module and drive.
➑ Source Length
This box contains the number of bytes of service data to be sent in
the message.
➒ Destination
This box contains the name of the tag that will receive service
response data from the module and drive.
➓ Path
The path is the route that the message will follow.
Note: Click Browse to find the path or type in the name of a module
that you previously mapped.
Name
The name for the message.
Box Description
Figure 7.1 – ControlLogix Message Format in RSLogix 5000 (Continued)