Allen-Bradley ControlLogix L7 User Manual

Rockwell Automation Publication 1756-UM001M-EN-P - February 2012 215
Using Electronic Keying Appendix B
Firmware Update for the module via the Firmware Supervisor feature from a
Logix5000 controller.
Compatible Keying
Compatible Keying indicates that the module determines whether to accept or
reject communication. Different module families, communication adapters, and
module types implement the compatibility check differently based on the family
capabilities and on prior knowledge of compatible products.
Compatible Keying is the default setting. Compatible Keying allows the physical
module to accept the key of the module configured in the software, provided that
the configured module is one the physical module is capable of emulating. The
exact level of emulation required is product and revision specific.
EXAMPLE
In the following scenario, Exact Match keying prevents I/O communication.
The module configuration is for a 1756-IB16D module with module revision 3.1. 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 does not match precisely.
Module Configuration
Vendor = Allen-Bradley
Product Type = Digital Input Module
Catalog Number = 1756-IB16D
Major Revision = 3
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 prevented.
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.

Allen-Bradley ControlLogix L7 Specifications

General

Brand	Allen-Bradley
Model	ControlLogix L7
Category	Controller
Language	English