Chapter 7: using devicenet explicit messaging, Chapter objectives, Required equipment – Rockwell Automation 1336-GM6 Enhanced DeviceNet Communications Module User Manual
Page 71: Message translations, Chapter 7, Using devicenet explicit messaging, Chapter
Chapter
7
Using DeviceNet Explicit Messaging
Chapter Objectives
Chapter 7 provides information you need to monitor and configure
the SCANport device using explicit messaging on DeviceNet. In this
chapter, you will read about the following:
•
Required equipment.
•
Message translations.
•
Messaging guidelines for the 1771-SDN scanner.
•
Messaging guidelines for the 1747-SDN scanner.
•
Example messages.
•
Using messages to control SCANport products.
•
Writing to register objects.
Refer to Appendix C, DeviceNet Objects, for information on object
data support.
Required Equipment
Before using messaging, your PC must be:
•
Running Logix5 and RSLinx if you are using a PLC. Refer to
http://www.software.rockwell.com for more information on these
products.
•
Running RSLogix500 and RSLinx if you are using an SLC. Refer
to http://www.software.rockwell.com for more information on
these products.
•
Connected to and communicating with the controller.
Message Translations
The communications adapter provides electronic translations of
DeviceNet explicit messages into SCANport messages and back. The
format of all explicit messages supported by the adapter is 8:16. The
class field is 8 bits long, and the instance field is 16 bits long.
!
ATTENTION: Hazard of equipment damage exists. If
explicit messages are programmed to frequently write
parameter data to certain drive products, the EEPROM
(Non-Volatile Storage) will quickly exceed its life cycle
and cause the product to malfunction. Do not create a
program that frequently uses explicit messages to write
parameter data to a product. Datalinks do not write to
the EEPROM and should be used for frequently changed
parameters.