Rockwell-automation 25-COMM-P PowerFlex PROFIBUS DPV1 Adapter Uživatelský manuál stáhnout pdf (Strana 52)

52 Rockwell Automation Publication 520COM-UM004A-EN-E - November 2013

Chapter 6 Using Acyclic Messaging

Write Example for Host Parameter 41 [Accel Time 1]

To write to the PowerFlex 520-series drive parameter 41[Accel Time 1] using a

Class 1 Acyclic Write Service, setup a CompactLogix controller (with a MVI69-

PDPMV1 PROFIBUS Master). After the master is setup, the CompactLogix

tags must be populated with the correct slot and index addressing values to write

the parameter as shown in Class 1 Acyclic Write for

Host Parameter 41 [Accel

Time 1] on page 53.

Host parameter 41[Accel Time 1]:

• Slot Number = 0x00 + Quotient of (41/256) + 1 = 1

• Index Number = Remainder of (41/256) = 41

• Length in bytes of the value of the parameter (16-bit integer value) / 8 = 2

To test the Write Service, you may manually enter the values as shown below into

the MVI69-PDPMV1 controller scoped tags where a ProSoft MVI69-PDPMV1

PROFIBUS master module has been installed in the backplane of the

CompactLogix controller rack.

• MVI69PDPMV1.Mailbox.Class1AcyclicWrite.Out.SlotNumber = 1

• MVI69PDPMV1.Mailbox.Class1AcyclicWrite.Out.SlaveAddress = 3

• MVI69PDPMV1.Mailbox.Class1AcyclicWrite.Out.Length = 2

• MVI69PDPMV1.Mailbox.Class1AcyclicWrite.Out.Index = 41

The data bytes to be written can be entered in the

MVI69PDPMV1.Mailbox.Class1AcyclicWrite.Out.Data[] array, or the data

may be copied using ladder logic and a locally configured program tag which

represents the correct data type, for the data value, to be written to Host

parameter 41 [Accel Time 1]. In this example, the value would be an integer data

type. The value shown in Class 1 Acyclic Write for

Host Parameter 41 [Accel

Time 1] on page 53 indicates a value of 20.00 seconds.

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Rockwell-automation 25-COMM-P PowerFlex PROFIBUS DPV1 Adapter Uživatelský manuál Strana 52