User Manual Section 12
GFK-2958L May 2021
LED Indicators and Troubleshooting 493
Red lights up briefly twice: Output
of the sync manager watchdog
out-of-date
Check that the network adapter firmware is
up-to-date. Compare the master cycle time
with the time set up on watchdog timer
Red flashing: Configuration error
Green: Supply voltage for input
current path > 18Vdc
Red: Supply voltage for input
current path < 18Vdc
Red: Internal fuse defective
Replace the network adapter
Green: Supply voltage for output
current path > 18Vdc
Red: Supply voltage for output
current path < 18Vdc
Red: Internal fuse defective
Replace the network adapter
Off, and the status LED of the module is
green: Defective network adapter
Have the network adapter repaired or
replaced
The internal fuse was triggered due to an
overload
Off, and the module status LED is off:
Improper supply voltage
Red: Configuration error, or error in the
network adapter, or error in a module,
or there is a new diagnostic message
Check if the configured station setup
matches the actual setup
Read the diagnostic message with the web
server or an engineering tool and
determine which further actions to take
Red flashing: Station in Force mode
Red: No connection to the fieldbus
Check the fieldbus cable and the PLC
configuration
Red flashing: Configuration error, no
connection to the control unit, or error
in the parameter set
Check if the configured station setup
matches the actual setup
Check the master configuration and try
again to establish connection
Yellow: Error on the system bus or the
fieldbus
Check that the modules have been
snapped into place properly
Check the fieldbus cabling
Check the fieldbus connection parameters
Green: Connection established between
port 1 of the network adapter and
another field device
Green flashing: Data being exchanged
on port 1
Check the connection to the next
participant and the fieldbus cable
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