Rockwell Automation Publication IOLINK-UM001A-EN-P - August 2017 39
Message Structure and Configuration Examples Appendix B
Read Data from the Sensor
Once the data in the Message Instruction dialog box has been populated,
trigger the rung of logic that contains the message instruction. The “Vendor
Name” is read from the 836P and copied into the “Read_Assembly” Array.
When viewed as ASCII the name Allen-Bradley is displayed.
Example Format of a Write Message
It is possible to Write a unique name to the 836P sensor. This Parameter is
called “Application Specific Name.” In the Device Parameters appendix of
836P-UM001
, we can find the Index Number for this Parameter (24) and the
maximum length of the String (32 characters). Each character is equivalent to
one byte. This example shows the steps necessary to write “Test” to the
Application Specific Name index.
The source element Array is “Write_Assembly,” byte zero is the channel
followed by the data to be written.
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