204
DeviceNet
31.5. Bus status display
The bus status is indicated on the display on the device.
Display
(is displayed approx.
every 3 seconds)
Device status Explanation Troubleshooting
BUS offline
Offline
Device is not connected to the
bus.
The network access procedure
(Duplicate MAC-ID-Test,
duration approx. 2 s) has still
not ended.
The device is the only active
network node.
• Check whether the baud
rate has been correctly set
network-wide.
• Bus connection including
plug assignment correct.
• Check operating supply and
bus connection of the other
nodes.
BUS no connection
Online,
no connection to
the master
Device is connected correctly to
the bus, the network access pro-
cedure has ended without errors,
however there is no established
connection to the master.
• New connection established
by master.
BUS timeout
I/O connection
timeout
An I/O connection is in the
TIME OUT state.
• New connection established
by master.
• Ensure that I/O data is
transferred cyclically or, if
COS confirmed, that cor-
responding Acknowledge
messages are sent by the
master.
BUS critical err
Critical bus error
Other device with the same
address in the network.
BUS offline due to communi-
cation problems.
• Change address of the
device and restart device
• Error analysis in the network
with a bus monitor.
Table 113: Bus status display; DeviceNet
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