18 Publication 1756-PM004C-EN-P - October 2009
Chapter 1 Communicate with I/O Modules
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
.
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
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