Rockwell Automation Publication IOLINK-UM001A-EN-P - August 2017 37
Appendix B
Message Structure and Configuration
Examples
Configure a Message
Instruction
This appendix 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
shown.
Example Format of a Read Message
In this example, the steps that are shown are necessary to read the IO-Link
parameter value for “Vendor Name:” from the 836P sensor. The screen capture
that is shown is the Message Configuration dialog box that shows the
information that is required to complete this task. To open this dialog box,
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 the Device Parameters appendix of 836P-UM001
. It
shows the Index Number, Data Type, and Size of the Parameters that are
available in the 836P sensor. To complete the dialog box, the Service Code and
Source Length must be provided.
A table of the different Read and Write Service Codes and their associated
Source Lengths are shown on page 42
.
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