Rockwell Automation 1734-ADNX POINT I/O DeviceNet Adpater User Manual - Manual (Page 32)

Publication 1734-UM002C-EN-P - July 2003
2-12 What is the 1734-ADN(X) Adapter?
Backplane Autobaud
The adapter itself never autobauds on the Subset. Backplane
Autobaud automatically enables or disables Autobaud for all I/O
modules currently attached to the backplane. The adapter does not set
a specific rate, though (as with Backplane Baudrate).
If you enable Backplane Autobaud in the adapter or the EDS
parameter access that you set from the primary DeviceNet, the adapter
only enables the Autobaud in all backplane I/O modules. When the
modules listen to communications on the DeviceNet network, they
detect the rate of communication and automatically set their own
baudrates to match the network rate.
The module does not actually automatically detect the backplane
baudrate until power is cycled or the module is reset.
Enable Backplane Baudrate in RSNetWorx for DeviceNet.
TIP
Autobaud, when enabled, is useful if you swap
POINT I/O modules between networks that are
operating at different baudrates.
IMPORTANT
Changes to the Backplane Autobaud parameter only
take effect if they are downloaded on an individual
basis (e.g., If you enable the Backplane Autobaud
setting and download the change with additional
changes to other features, the Backplane Baudrate
remains disabled).
This parameter should be set to “Do Nothing” when
you download all parameters or when Automatic
Device Replacement is enabled for the adapter.
If you want to set an I/O module to use a specific
baudrate (i.e., 125, 250, 500), you must first disable
Autobaud for that module.