Rockwell Automation Allen-Bradley ControlNet 1734-ACNR User Manual page 38

3-6 Configure a ControlNet Module
Keying Option Definition
Exact Match When a controller establishes a connection with the ControlNet module, the following parameters must match
or the inserted module will reject the connection:
Compatible Match When a controller establishes a connection with the ControlNet module, the inserted module decides whether
it is compatible with the parameters listed above. Generally, all except Minor Revision must match or it will
reject the connection.
Disable Keying When a controller establishes a connection with the ControlNet module, the inserted module attempts to
accept the connection regardless of its type.
Even if keying is disabled, a controller will not establish a connection if the slot is configured for one module
type such as a communication module, and a module of another type such as an output module, is inserted in
the slot.
Publication CNET-UM001C-EN-P - November 2005
This table describes the keying options available in RSLogix 5000 software.
Table 3.2 Electronic Keying Options
• Vendor
• Product Type
• Catalog Number
• Major Revision
• Minor Revision
We recommend using Compatible Match whenever possible. However, keep in mind
TIP
that modules can emulate older revisions and, with major revision changes, the module
only works to the level of the configuration.
If a slot is configured for a module with major.minor revision of 1.7 and you insert a
module with a major.minor revision of 2.3, the module works at the 1.7 level, with
respect to module functions that are related to RSLogix 5000 software such as interface
changes. However, bug fixes that are affected by the module's firmware, would work at
the 2.3 revision level.
If possible, we suggest you make sure configuration is updated to match the revision
levels of all I/O modules. Failure to do so may not prevent the application from working
but may defeat the purpose of upgrading your modules' revision levels.
Be extremely cautious when using the disable keying option; if used incorrectly, this
ATTENTION
option can lead to personal injury or death, property damage or economic loss.