Rockwell Automation 20-COMM-K CANopen Adapter - Manual (Page 53)

20-COMM-K CANopen Adapter User Manual
Publication 20COMM-UM012B-EN-P
Chapter 6
Using Service Data Objects
This chapter provides information and examples that explain how to use
Service Data Objects (SDOs) to configure and monitor the adapter and
connected PowerFlex 7-Class drive.
About Service Data Objects Service Data Objects (SDOs) use asynchronous data transmission and are
used to access objects without mapping them to an I/O (PDO) connection.
With SDOs, you can configure and monitor a slave device’s parameters on
the CANopen network.
SDO data transmission is much slower, working around the process data
channels, to read/write parameters to a drive. This handles one parameter at
a time and the user has access to all CANopen objects in the adapter. SDO
messages can transfer more than 8-bytes, which is the PDO limit.
Topic Page
About Service Data Objects 6-1
Running Service Data Objects 6-2
CANopen DPI Parameter Access 6-2
CANopen DPI Full Parameter Access 6-3
!
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.