Allen-Bradley 1756-L65 ControlLogix 5565, Programming Manual

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Rockwell Automation Publication 1756-PM004D-EN-P - September 2012 15
Communicate with I/O Modules Chapter 1
By doing this, you can avoid the case of a physical module rejecting the keying
request because it is an earlier revision than the one configured in the software.
EXAMPLE
In the following scenario, Compatible Module prevents I/O communication :
The module configuration is for a 1756-IB16D module with module revision 3.3.
The physical module is a 1756-IB16D module with module revision 3.2. In this case,
communication is prevented because the minor revision of the module is lower
than expected and may not be compatible with 3.3.
Module Configuration
Vendor = Allen-Bradley
Product Type = Digital Input
Module
Catalog Number = 1756-IB16D
Major Revision = 3
Minor Revision = 3
Physical Module
Vendor = Allen-Bradley
Product Type = Digital Input Module
Catalog Number = 1756-IB16D
Major Revision = 3
Minor Revision = 2
Communication is prevented