Rockwell Automation 1756-IF4FXOF2F ControlLogix High-speed Analog I/O Module - Manual (Page 28)

28 Rockwell Automation Publication 1756-UM005B-EN-P - January 2013
Chapter 3 Module Features
module rejecting the keying request because it is an earlier revision than the one
configured in the software.
EXAMPLE In this scenario, Compatible Keying 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.