Rockwell Automation 20-750-PBUS Profibus DPV1 Option Module - Manual (Page 63)

Rockwell Automation Publication 750COM-UM004B-EN-P - September 2012 63
Acyclic Messaging Chapter 6
copied via ladder logic and a locally configured program tag which represents the
correct data type, for the data value, to be written to drive parameter 520. In this
example, the value would be a floating point or ‘REAL’ data type. The value
shown in
Figure 14 , indicates a value of 60.00 Hz.
Figure 14 - Acyclic Class 1 Write for Parameter 520 - [Max Fwd Speed]
To manually trigger the message to be sent, enter a value of '1' into the
MVI56PDPMV1.MailboxCommand.AcyclicWrite tag.
The message response status indicates success when the data in the
‘MVI56PDPMV1.Mailbox.AcyclicWrite.In.ErrorDecode’ tag is a value of 0x00.
Note that any non-zero value indicates an error has occurred.
Acyclic Class 1 Write response data can be viewed as shown in Figure 15 .
Figure 15 - Acyclic Class 1 Write Response Data for Parameter 520 - [Max Fwd Speed]