Rockwell Automation 1757-FFLDC4 FOUNDATION Fieldbus System User Manual - Manual (Page 95)

Rockwell Automation Publication 1757-UM012A-EN-P - July 2011 95
Create an RSLogix 5000 Software Project Chapter 5
Figure 7 - General Tab
Exact Match
Exact Match keying requires all keying attributes, that is, Vendor, Product Type,
Product Code (catalog number), Major Revision, and Minor Revision, of the
physical module and the module created in the software to match precisely to
establish communication. If any attribute does not match precisely, I/O
communication is not permitted with the module or with modules connected
through it, as in the case of a communication module.
Use Exact Match keying when you need the system to verify that the module
revisions in use are exactly as specified in the project, such as for use in highly-
regulated industries. Exact Match keying is also necessary to enable Automatic
Firmware Update for the module via the Firmware Supervisor feature from a
Logix5000 controller.
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.