Allen-Bradley ControlNet Compact GuardLogix 1769, User Manual, Page: 38 / 100

Chapter 3 Configure a ControlNet Module
Electronic keying is based on a set of attributes unique to each product revision.
When a Logix5000 controller begins communicating with a module, this set of
keying attributes is considered.
Table 8 - Keying Attributes
Attribute Description
Vendor The manufacturer of the module, for example, Rockwell Automation/Allen-
Bradley.
Product Type The general type of the module, for example, communication adapter, AC
drive, or digital I/O.
Product Code The specific type of module, generally represented by its catalog number,
for example, 1756-IB16I.
Major Revision A number that represents the functional capabilities and data exchange
formats of the module. Typically, although not always, a later, that is
higher, Major Revision supports at least all of the data formats supported
by an earlier, that is lower, Major Revision of the same catalog number
and, possibly, additional ones.
Minor Revision A number that indicates the module’s specific firmware revision. Minor
Revisions typically do not impact data compatibility but may indicate
performance or behavior improvement.
You can find revision information on the General tab of a module’s Properties
dialog box.
Figure 9 - General Tab
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.
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 in
order 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.
38 Rockwell Automation Publication CNET- UM001E-EN-P - June 2016