2 running explicit messages – Rockwell Automation RECOMM-IBUS Interbus Communications Module User Manual
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7-2
Interbus Communications Module
7.2
Running Explicit Messages
There are five basic events in the Explicit Messaging process as
shown in figure 7.1. 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.
Retrieve Parameter
Message Response
Complete Parameter
Message
Set up and send
Parameter Message
Format the required data and set up the ladder
logic program to send an Explicit Message
request to the scanner module (download).
The scanner module transmits the Explicit
Message Request to the slave device over the
Interbus network.
The slave device transmits the Explicit Message
Response back to the master.
The controller retrieves the Explicit Message
Response.
The Explicit Message is complete.
Figure 7.1 – Explicit Message Process