Rockwell Automation 160-DN2 160-DN2 DeviceNet Communication Module FRN 3.xx - Manual (Page 61)

Publication 0160-5.18 - June 2003
Using 160-DN2 with DeviceNet Scanner 6-23
Using Explicit Messaging This section provides information and examples that explain how to
use Explicit Messaging to monitor and configure the 160-DN2
module and connected Bulletin 160-SSC drive.
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 DeviceNet network.
Formatting Explicit Messages
Explicit Messages for a ControlLogix Controller
ControlLogix scanners accommodate both downloading Explicit
Message Requests and uploading Explicit Message Responses. The
scanner module can accommodate one request or response for each
transaction block. Each transaction block must be formatted as shown
in
Figure 6.17 . For explicit message class codes and attribute
information, refer to Appendix B .
!
ATTENTION: Hazard 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 does not assume responsibility or liability
(to include intellectual property liability) for actual use
of the examples shown in this publication.
!
ATTENTION: Hazard 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.