KEYENCE DL-PN1 - Manual (Page 24)

22 - PROFINET Communication Unit DL-PN1 User's Manual (GT) -
Troubleshooting
The indicator LEDs on the DL-PN1 can be used to determine the causes of errors.
 Link/activity indicator (LINK/ACT)
This indicator indicates whether the DL-PN1 is communicating correctly.
 System Failure indicator (SF)
This indicator indicates whether the DL-PN1 is operating normally.
Link/activity indicator (Green)
System Failure indicator (Orange, Red)
Bus Failure indicator (Red)
Sensor communication indicator (Green, Red)
LED Status Condition Corrective Action
Green
Solid The DL-PN1 is normally linked. -
Flashing
The DL-PN1 is normally linked and is
now exchanging data.
-
Not lit
Power is not supplied to the DL-PN1.
The DL-PN1 is not linked.
• Check if the power supply is correctly connected.
• Check if the DL-PN1 is correctly connected to the
sensor amplifier.
• Check if the IP address is correct.
• Check if the power supply of the connected device
or Ethernet switch is correctly connected.
• Check if the cable is correctly connected.
LED Status Condition Corrective Action
Solid red
There may be a system error on the
DL-PN1 or a connected sensor.
• Check the D-bus LED status.
• Check if the number of connected sensor
amplifiers exceeds the maximum number of
connectable units.
• Check if the IP address is correct.
• Check if the slot number is correct.
• Check if the DL-PN1 is correctly connected to the
sensor amplifier.
• Check if there is an electrical noise source near the
DL-PN1.
Flashing orange
Flash LED was requested on the I/O
controller.
Flashes approximately 4 times per
second.
-
Not lit The DL-PN1 is normally operating. -