User Manual
29
- PROFINET Communication Unit DL-PN1 User's Manual (IB) -
Types of error and error code
 Error code list
The following error codes may occur in the DL-PN1.
 DL-PN1
Error code Description Cause Actions
0 No error -
-
51 Unassigned ID error
The main unit assigned no ID 
within 10 seconds after the 
DL-PN1 had been started.
• Check if the number of connected sensor 
amplifiers exceeds the maximum number 
of sensor amplifiers that can be 
connected to the main unit.
 "Types and Number of Connectable 
Sensor Amplifiers" (page 3)
• Check the connection with the sensor 
amplifiers and then turn the power on 
again.
If this error cannot be recovered, contact 
your nearest KEYENCE office.
52
Start-time 
communication error
Communication between sensor 
amplifiers ended abnormally 
before ID assignment 
completion.
Check the connection with the sensor 
amplifiers and then turn the power on again.
If this error cannot be recovered, contact 
your nearest KEYENCE office.
53
Unsupported sensor 
amplifier connection 
error
A sensor amplifier not supported 
by the DL-PN1 is connected.
Check the model of the connected sensor 
amplifier and remove the sensor amplifier if 
it is not supported by the DL-PN1.
54 Mixed model error
Sensor amplifiers outside the 
specifications have a mixed 
connection.
Check if the models are mixable.
55
Start-time 
communication error
ID number assignment is 
successful but communication 
failed during the subsequent 
initial communication.
Check the connection with the sensor 
amplifiers and then turn the power on again.
If this error cannot be recovered, contact 
your nearest KEYENCE office.
56
Current limitation 
error
The number of connected 
sensor amplifiers exceeds the 
allowable range.
Use sensor amplifiers within the allowable 
range.
57
Communication error 
between sensor 
amplifiers
An error occurred during 
communication between sensor 
amplifiers.
Check if there is a noise source around the 
DL-PN1.
If the sensor communication indicator is 
solid red, turn the power on again.
100 System error The IP address is incorrect.
Contact your nearest KEYENCE office.
101 System error
A default gateway setting error 
occurred.
102 System error
An attempt to read data in 
EEPROM such as the MAC 
address has failed.
103 System error
An attempt to start the protocol 
stack has failed.
104 System error
An attempt to access FlashROM 
has failed.
150 System error
The number of held IDs is 
incorrect.
151 System error
The number of sensors is 
incorrect.
152 System error An initial read error occurred.










