Rockwell Automation 842D-60131331BXA DeviceNet Encoder User Manual - Manual (Page 35)

Chapter
6
Using DeviceNet Explicit
Messaging
Chapter Objectives Chapter 6 provides information you need to monitor and configure
the encoder using explicit messaging on DeviceNet. In this chapter,
you will read about the following:
• Required equipment.
• Messaging guidelines for the 1747-SDN scanner.
• An Explicit Messaging example.
Refer to Appendix B, DeviceNet Objects, for information on object
data support.
Required Equipment Before using messaging, your PC must be:
• Running RSLogix500 and RSLinx if you are using an SLC. Refer
to http://www.software.rockwell.com for more information on
these products.
• Running RSLogix5000 and RSLinx for Logix platforms. Refer to
http://www.software.rockwell.com for more information on these
products.
• Connected to and communicating with the controller.
Explicit Messaging
Examples Explicit Messaging Preset Example for the 1747-SDN
Scanner
The SLC copies an Explicit Message into the scanner’s M0-file.
When the copy is completed the scanner moves the message into a
queue for processing. Up to 10 Explicit Messages can be in this
queue.
When the scanner receives a response message it is placed into a
queue. The first response in the queue is available from the M1-file.
When the message delete command is copied into the scanner the
message is complete and the next available response will appear in
the M1-file.
!
ATTENTION: The PRESET function results in a
change of position reading. This can cause unexpected
motion which could result in personal injury and damage
to the product or equipment. During PRESET, steps
should be taken to ensure the shaft is stationary and will
remain so.