Rockwell Automation 1756-HYD02 ControlLogix Hydraulic Servo Module - Manual (Page 48)

48 Publication 1756-UM525A-EN-P - June 2003
Chapter 4 Using the 1756-HYD02 Module Features
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 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