Rockwell Automation Allen-Bradley 856T-B24LC, User Manual, Page: 47 / 82

Rockwell Automation Publication 856T-UM001B-EN-P - April 2021 47
Chapter
7
Message Structure and Configuration Example
Configure a Message
Instruction
This section provides additional information and examples that explain how to
configure a Message Instruction.
In the examples that we show, we are assuming the use of the ControlLogix®
controller. A ControlLogix controller can accommodate both downloading
Explicit Message Requests and uploading Explicit Message Responses. The
Message Instruction dialog blocks must be formatted as shown in the
examples that are given in this chapter.
Example Format of a Read
Message
In this example, the steps necessary to read the IO-Link parameter value for
Vendor Name from the 856T-B24LC module are shown. The Message
Configuration window shows all information that is required to complete this
task. To open this window, click the blue square box in the Message
Instruction.
Some of the data that are required to complete the Message Configuration
dialog box comes from
Appendix C on page 57 . Appendix C shows the Index
Number, Data Type, and Size of all parameters that are available in the IO-Link
module. To complete the dialog box, the Service Code and Source Length must
be provided.
Service Code on page 51 shows the different Read and Write Service Codes and
their associated Source Lengths.