Rockwell Automation 20-COMM-ER 20-COMM-ER Dual-Port EtherNet/IP Communication Adapter User Manual - Manual (Page 107)

Rockwell Automation Publication 20COMM-UM015B-EN-P - July 2013 107
Using Explicit Messaging Chapter 6
Figure 34 - Explicit Message Process
For information on the maximum number of Explicit Messages that can be
executed at a time, see the documentation for the scanner or bridge and/or
controller that is being used.
Event Description
➊
You format the required data and set up the ladder logic program to send an Explicit
Message request to the scanner or bridge module (download).
➋
The scanner or bridge module transmits the Explicit Message Request to the slave device
over the network.
➌
The slave device transmits the Explicit Message Response back to the scanner. The data is
stored in the scanner buffer.
➍ The controller retrieves the Explicit Message Response from the scanner’s buffer (upload).
➎ The Explicit Message is complete.
➎
➊
➋ ➌
➍
Complete Explicit
Message
Retrieve Explicit
Message Response
Set up and send Explicit
Message Request
Ethernet
Switch