Rockwell Automation 1769-ADN Compact I/O 1769-ADN DeviceNet Adapter - Manual (Page 105)

Publication 1769-UM001B-EN-P - October 2002
Configuring Your Compact I/O Series B DeviceNet Adapter 4-29
Comparison Feature
The comparison feature regards matching. A match or mismatch is
determined based on a comparison of the programmed devices (the
devices stored in the adapter’s non-volatile memory) and the actual
devices present on the 1769 bus. The electronic keying options
(below) are applied on a position-by-position basis.
Each desired device and its location, modified by its electronic key
option (if settable), must match the corresponding actual device. If the
electronic key option for a device is set to Exact Match, then the
desired device’s type (vendor id, product type, and product code),
major revision, and minor revision must exactly match its
corresponding actual device to consider this entry a match.
If the electronic key option is set to Disable Keying, then the device
can be any type and revision and will be considered a match to its
corresponding actual device.
If the electronic key option for a device is set to Compatible Module,
then the desired device’s type must exactly match and its major/minor
revision must be equal to or less than the corresponding actual
device’s type. A major/minor revision of 2.3 is considered greater than
a major/minor revision of 1.9.
Remember, in order for the system keying configuration to be valid,
all of the desired devices (modified by their keying option) must
match.
IMPORTANT
Disable keying is not recommended because it will
allow an improper 1769 system configuration.