98 Rockwell Automation Publication 750COM-UM009A-EN-P - May 2017
Chapter 5 Using Explicit Messaging
Performing Explicit
Messaging
There are five basic events in the Explicit Messaging process. The details of
each step vary depending on the type of controller being used. See the
documentation for your controller.
Figure 18 - Explicit Message Process
For information on the maximum number of Explicit Messages that can be
executed at a time, see the documentation for the bridge or communication
bridge and/or controller that is being used.
Event Description
1 You format the required data and configure the ladder logic program to send an Explicit Message request to
the communication bridge (download).
2 The communication bridge transmits the Explicit Message Request to the controlled device over the
network.
3 The controlled device transmits the Explicit Message Response back to the communication bridge. The data
is stored in the communication bridge buffer.
4 The controller retrieves the Explicit Message Response from the communication bridge buffer.
5 The Explicit Message is complete.
Complete Explicit
Message
Retrieve Explicit
Message Response
Configure and send Explicit
Message Request
Ethernet
Switch
Network
1
5
4
2
3
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