Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules - Manual (Page 41)

Publication 1756-UM009C-EN-P - December 2010 41
ControlLogix Analog I/O Module Features Chapter 3
EXAMPLE
In the following 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