Rockwell-automation 20-750-PBUS Profibus DPV1 Option Module Manual de usuario descargar pdf (Pagina 61)

Rockwell Automation Publication 750COM-UM004B-EN-P - September 2012 61

Acyclic Messaging Chapter 6

Figure 11 - Acyclic Class 1 Read for Parameter 1 - [Output Frequency]

When the message response successfully returns, the data for the Output

Frequency parameter will be placed in the tags

MVI56PDPMV1.Mailbox.AcyclicRead.In.Data[] byte array. In the controller

program, the return message data may be copied to a locally configured program

tag, and converted by correctly assigning the data type for the Local tag to which

the data returned from the read request matches. In this drive parameter 1 -

[Output Frequency] example, the local tag's data type should be a floating point

or a ‘REAL’ data type.

Acyclic Class 1 Read response data can be viewed as shown in Figure 12

Figure 12 - Acyclic Class 1 Read Response Data for Parameter 1 - [Output Frequency]

Figure 13 shows the RSLogix ladder logic example, that may be used to interface

the MVI56-PDPMV1 module’s functional block and perform continuous DPV1

Acyclic Read operations.

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Rockwell-automation 20-750-PBUS Profibus DPV1 Option Module Manual de usuario Pagina 61