Electronic Keying Mismatch in RSLogix
There are few major reasons why you would get electronic keying mismatch error in RSLogix.
Major / Minor Revisions
If the major or minor revisions of the module in the chassis does not match the one set in the program you will get the keying mismatch error.
Catalog Number of the module
If the catalog number of the module does not match the one set in the program
Check Module Slot Number
Many times the module in your program is placed in a different slot than it actually is in the chassis. Check the chassis and make sure that is not the case before you go any further.
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