Rockwell Automation Publication 1756-UM058G-EN-P - November 2012 229
Use Ladder Logic To Perform RunTime Services and Reconfiguration Appendix C
The user-defined WHO data structure displays module identification
information in an easily understood format. For example, the Controller Tags
dialog box shows the module’s major revision is 2.
You do not have to create the user-defined data structure. If you choose not to
create this structure, you can use the ASCII string and String length to retrieve
and understand module identification through some interface excluding
RSLogix 5000 software.
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