Rockwell Automation 25-COMM-D PowerFlex 525 DeviceNet Adapter - Manual (Page 55)

Rockwell Automation Publication 520COM-UM002A-EN-E - April 2013 55
Chapter
6
Using Explicit Messaging
This chapter provides information and examples that explain how to use Explicit
Messaging to configure and monitor the adapter installed and connected to the
PowerFlex 525 drive.
See Chapter 5 for information about the I/O Image, using Logic Command/
Status, Reference/Feedback, and Datalinks.
About Explicit Messaging Explicit Messaging is used to transfer data that does not require continuous
updates. With Explicit Messaging, you can configure and monitor a slave device’s
parameters on the network.
Explicit Messaging Class Code Compatibility with PowerFlex 525 Drives
Topic Page
About Explicit Messaging 55
Performing Explicit Messaging 56
CompactLogix Examples 56
ATTENTION: Risk of injury or equipment damage exists. The examples in this
publication are intended solely for purposes of example. There are many
variables and requirements with any application. Rockwell Automation, Inc.
does not assume responsibility or liability (to include intellectual property
liability) for actual use of the examples shown in this publication.
ATTENTION: Risk of equipment damage exists. If Explicit Messages are
programmed to write parameter data to Non-Volatile Storage (NVS) frequently,
the NVS will quickly exceed its life cycle and cause the drive to malfunction. Do
not create a program that frequently uses Explicit Messages to write parameter
data to NVS. Datalinks do not write to NVS and should be used for frequently
changed parameters.
ATTENTION: If you need to make frequent parameter changes using Explicit
Messages, set Host parameter C121 [Comm Write Mode] to 1 “RAM only”.
IMPORTANT PowerFlex 525 drives have explicit messaging limitations. See Explicit
Messaging Class Code Compatibility with PowerFlex 525 Drives on page 55 for
more information.
DeviceNet Object Class Code Compatibility Explicit Messaging Function
Parameter Object 0x0F Yes Single parameter reads/write
DPI Parameter Object 0x93 Yes with limitations Single and scattered parameter reads/write