Rockwell Automation 25-COMM-P PowerFlex PROFIBUS DPV1 Adapter - Manual (Page 50)

50 Rockwell Automation Publication 520COM-UM004A-EN-E - November 2013
Chapter 6 Using Acyclic Messaging
Class 1 Acyclic Read for Host Parameter 1 [Output Freq]
When the message response successfully returns, the data for the Output
Frequency parameter will be placed in the tags
MVI69PDPMV1.Mailbox.Class1AcyclicRead.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 requests matches. In this
Host
parameter 1 [Output Freq] example, the local tag’s data type should be an
integer.
Class 1 Acyclic Read response data can be viewed as shown in Class 1 Acyclic
Read Response Data for Host Parameter 1 [Output Freq] on page 51 .
Change value of tag to “1” to send
Class 1 Acyclic Read Command.
Copy or insert values for parameter read request:
- Parameter Slot Number
- Slave Node Address
- Length of Data (Bytes)
- Parameter Index