Allen-Bradley SLC 500 DeviceNet, User Manual, Page: 98 / 139

Publication 1747-6.5.5 - August 2000
7-2 Troubleshooting
Network Status Indicator
The bicolor (green/red) network status indicator (NET) provides
troubleshooting information about the DeviceNet channel
communication link.
Table 7.B - Network Status Indicator
If the NET
indicator is: Then Which indicates Take this action
Off The device has no power or the
channel is disabled for communication
due to bus off condition, loss of
network power, or has been
intentionally disabled. The channel is disabled for
DeviceNet communication. Power-up the module, provide network power
to the channel, and be sure the channel is
enabled in both the module configuration
table and the module command word.
Green Normal operation. All slave devices in the scan list
table are communicating
normally with the module. None.
Flashing Green The two-digit numeric display for the
channel indicates an error code that
provides more information about the
condition of the channel. The channel is enabled but no
communication is occurring. Configure the scan list table for the channel
to add devices.
Flashing Red The two-digit numeric display for the
channel displays an error code that
provides more information about the
condition of the channel. At least one of the slave devices
in the module’s scan list table
has failed to communicate with
the module. Examine the failed device and the scan list
table for accuracy.
Red The communications channel has
failed. The two digit numeric display
for the channel displays an error code
that provides more information about
the condition of the channel. The module may be defective. Reset module. If failures continue, replace
module.