Publication PSS-UM001A-EN-P – December 2016
What is the H Series Fieldbus DeviceNet Adapter? 2-5
The baudrate may not take effect until power is recycled or the I/O
modules are reset.
IMPORTANT
Changes to the Backplane Baudrate parameter only take effect if
they are downloaded on an individual basis. (For example, if you
change the Backplane Baudrate and download the changes with
additional changes to other features, the Backplane Baudrate
remains at the previous setting.)
Also, 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 specifi c baudrate (i.e.,
125, 250, 500), you must fi rst disable Backplane Autobaud for
that module.
Backplane Baudrate performs the following functions:
• Sets the adapter’s Subnet baudrate
• Sends a message to all connected backplane I/O modules.
If an I/O module is set to autobaud, it receives the message,
but ignores the new baudrate.
Backplane Autobaud
The adapter itself never autobauds on the Subnet. Backplane
Autobaud automatically enables or disables Autobaud for all I/O
modules currently attached to the backplane. The adapter does not
set a specifi c 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 automatically detect the backplane baudrate
until power is cycled or the module is reset.
TIP
Autobaud, when enabled, is useful if you swap H Series Fieldbus
I/O modules between networks that are operating at different
baudrates.
Enable Backplane Baudrate in RSNetWorx for DeviceNet.
IMPORTANT
Changes to the Backplane Autobaud parameter only take effect
if they are downloaded on an individual basis. (For example, 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 specifi c baudrate (i.e.,
125, 250, 500), you must fi rst disable Autobaud for that module.
Auto Address
The EDS parameter Auto Address is available from the primary
DeviceNet and lets the user sequentially order the node addresses
of backplane I/O modules. This parameter is not a mode, but occurs
on a single occurrence only. The node address selected is assigned
to the module closest to the adapter. The next closest module is
assigned the next numerically higher value. The numbering pattern
continues for all connected backplane I/O modules.
Enable this parameter in the RSNetWorx for DeviceNet software.
IMPORTANT
Changes to the Auto Address parameter only take effect if
they are downloaded on an individual basis. (For example, if
you enable the Auto Address and download the changes with
additional changes to other features, the node addresses of the
I/O modules 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.
Physical List Acquire Status
The adapter maintains a physical list that indicates the order of the
node addresses of all H Series Fieldbus I/O modules present on
the backplane. Physical List Acquire Status shows the status of this
physical list acquire process.
The adapter requires that each backplane I/O module has a MACID
greater than that of its neighbor to its immediate left. The list is
created when power is applied to the adapter and each time a module
is inserted on the backplane.
The valid values are:
• Idle
• Busy
• Auto Start Mode
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