Specifications

Publication 1771-IN014B-EN-P - September 2001
DeviceNet Scanner Module Catalog Number 1771-SDN/C 35
Troubleshoot Your Module
The bicolor (green/red) module status indicator displays device status.
It indicates whether the device has power and is functioning properly.
Channels 1 and 2 each have a bicolor (green/red) network status
indicator. The following table provides troubleshooting information
about the Channel 1 and 2 communication links.
Your 1771-SDN Scanner Module has a node address/status indicator
that uses numeric displays to indicate diagnostic information about
your module. The display flashes at approximately 1 second
intervals, depending on network traffic. The following table
summarizes the meanings of the numeric codes.
If your indicator is: Then: Take this action:
Off There is no power applied to
the module.
Verify power connections and
apply power.
Green The module is operating
normally.
Do nothing.
Flashing Green The module is not configured. Configure the module.
Flashing Red There is an invalid
configuration.
Verify module switch settings.
Check configuration setup.
Red The module has an
unrecoverable fault.
Replace the module.
Module Status
Indicator
Channel 1
Top part of module
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.