Rockwell-automation 25-COMM-E2P PowerFlex 25-COMM-E2P Dual-Port EtherN Instrukcja Użytkownika Pobierz pdf (Strona 74)

74 Rockwell Automation Publication 520COM-UM003A-EN-E - June 2013

Chapter 6 Using Explicit Messaging

Explicit Messaging Class Code Compatibility with PowerFlex 520-series Drives

Performing Explicit

Messaging

There are five basic events in the Explicit Messaging process. The details of each

step will vary depending on the type of controller being used. See the

documentation for your controller.

Explicit Messaging Process

For information on the maximum number of Explicit Messages that can be

executed at a time, see the documentation for the bridge or scanner and/or

controller that is being used.

CompactLogix Controller

Examples

IMPORTANT

PowerFlex 520-series drives have explicit messaging limitations. See Explicit

Messaging Class Code Compatibility with PowerFlex 520-series Drives on

page 74 for more information.

EtherNet/IP Object Class Code Compatibility Explicit Messaging Function

Parameter Object 0x0F Yes Single parameter reads/write

DPI Parameter Object 0x93 Yes Single and scattered parameter reads/write

IMPORTANT

There must be a request message and a response message for all Explicit

Messages, whether you are reading or writing data.

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

Esc

Sel

1 (Front)1 (Front)1 (Front)

2 (Rear)

00:00:BC:2E:69:F6

Complete Explicit

Message

Retrieve Explicit

Message Response

Set up and send Explicit

Message Request

Network Network

TIP

To display the Message Configuration screen in RSLogix 5000 or Logix Designer,

add a message instruction (MSG), create a new tag for the message

(Properties: Base tag type, MESSAGE data type, controller scope), and click the

button in the message instruction.

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