Rockwell-automation 20-COMM-ER 20-COMM-ER Dual-Port EtherNet/IP Commun Uživatelský manuál stáhnout pdf (Strana 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

➋➌

➍

Complete Explicit

Message

Retrieve Explicit

Message Response

Set up and send Explicit

Message Request

Ethernet

Switch

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Rockwell-automation 20-COMM-ER 20-COMM-ER Dual-Port EtherNet/IP Commun Uživatelský manuál Strana 107