Rockwell Automation RECOMM-CNET ControlNet Communications Module - Manual (Page 62)

6-12 ControlNet Communications Module
6.8 About Explicit Messaging
Explicit Messaging is used to transfer data that does not require
continuous updates. With Explicit Messaging, you can configure
and monitor a slave device’s parameters on the ControlNet network.
6.8.1 Performing Explicit Messages
Important: 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: The scanner module may be integrated with the
controller (e.g., PLC-5C).
➊
➍
➎
Retrieve Parameter
Message Response
Complete Parameter
Message
Set up and send
Parameter Message
➋
➌
➊
Format the required data and set up the ladder
logic program to send an Explicit Message
request to the scanner module (download).
➋
The scanner module transmits the Explicit
Message Request to the slave device over the
ControlNet network.
➌ The slave device transmits the Explicit Message
Response back to the master.
➍ The controller retrieves the Explicit Message
Response.
➎ The Explicit Message is complete.
Figure 6.7 – Explicit Message Process