Rockwell Automation 1756-HYD02 ControlLogix Hydraulic Servo Module - Manual (Page 49)

Publication 1756-UM525A-EN-P - June 2003 49
Using the 1756-HYD02 Module Features Chapter 4
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