Rockwell Automation DEVICENET 1771-SDN, User Manual

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Publication 1771-6.5.132 - June 2000
7-2 Troubleshooting
Network Status Indicator
Each of the channels (1 and 2) on the 1771-SDN Scanner module has
a bicolor (green/red) network status indicator that provides
troubleshooting information about the channel’s communication links.
Node/Error Code Indicator
Each channel also has a Node/Error Code indicator that displays
numeric codes providing diagnostic information. The display flashes
at approximately one second intervals, depending on network traffic.
The following table summarizes the meanings of the numeric codes.
Network Status Indicator
If the indicator is Then Which indicates Take this action
Off The device has no power or the
channel is disabled for
communication due to a bus off
condition, loss of network power, or
it 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 scanlist 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 scanlist 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 scanlist table has failed to
communicate with the module.
The network has faulted. Examine the failed device and the
scanlist 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 the module. If failures continue,
replace module.
Numeric Display Code Summary
Numeric
Code
Description Take this action
0 - 63 Normal operation. The numeric code is
the 1771-SDN’s node address on the
DeviceNet network. None.
70 Module failed Duplicate Node Address
check. Change the module node address to
another available one. The node address
you selected is already in use on that
channel.
71 Illegal data in scanlist table (node
number alternately flashes). Reconfigure the scanlist table and
remove any illegal data.
72 Slave device stopped communicating
(node number alternately flashes). Inspect the field devices and verify
connections.
Top of Module
Node/Error Code Indicator