Rockwell Automation 1756-IF4FXOF2F ControlLogix High-speed Analog I/O Module - Manual (Page 29)

Rockwell Automation Publication 1756-UM005B-EN-P - January 2013 29
Module Features Chapter 3
EXAMPLE In this scenario, Compatible Keying allows I/O communication.
The module configuration is for a 1756-IB16D module with module revision
2.1. The physical module is a 1756-IB16D module with module revision 3.2. In
this case, communication is allowed because the major revision of the physical
module is higher than expected and the module determines that it is
compatible with the prior major revision.
IMPORTANT Changing electronic keying selections online may cause the I/O
communication connection to the module to be disrupted and may result in a
loss of data.
Module Configuration
Vendor = Allen-Bradley
Product Type = Digital Input Module
Catalog Number = 1756-IB16D
Major Revision = 2
Minor Revision = 1
Physical Module
Vendor = Allen-Bradley
Product Type = Digital Input Module
Catalog Number = 1756-IB16D
Major Revision = 3
Minor Revision = 2
Communication is allowed.