Rockwell Automation 1756-XXXX ControlLogix Digital I/O Modules User Manual
Page 229
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Rockwell Automation Publication 1756-UM058G-EN-P - November 2012
229
Use Ladder Logic To Perform Run Time 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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