BECKHOFF BK11x0, BK1250: Error Handling and Diagnosis

Diagnostic LEDs

After switching on, the Bus Coupler immediately checks the connected configuration. Error-free start-up is indicated when the red I/O ERR LED goes out. If the I/O ERR LED blinks, an error in the area of the terminals is indicated. The error code can be determined from the frequency and number of blinks /see below).

The BK1120 / BK1150 Bus Coupler has respectively a green LED at the RJ45 plug sockets, which indicate the state of the fieldbus (Fig. 1). The RUN and ERROR LEDs (BK1120: upper middle, BK1150: on the left hand side of the LED prism) indicate the state of the EtherCAT State Machine.

On the upper right hand side of the BK1120 are two more green LEDs that indicate the supply voltage. The left hand LED indicates the presence of the 24 V supply for the Bus Coupler. The right hand LED indicates the presence of the supply to the power contacts. As illustrated in Fig. 1, the corresponding diagnosis LEDs of the BK1150 are on the right hand side of the LED prism.

BK1120_DiagLEDsBK1150_LED

Fig. 1 Diagnosis LEDs Buscoupler BK1120, BK1150

The Diagnostic LEDs of the BK1250 are assigned as described in Fig. 2.

BK1250_DiagLEDs

Fig. 2 Diagnosis LEDs Buscoupler BK1250

LEDs for power supply diagnosis

LED Display Status Meaning
POWER SUPPLY green off - No operating voltage connected
on - 24 VDC operating voltage connected
POWER CONTACTS green off - No 24VDC power connected to the power contacts
on - 24VDC power connected to the power contacts

LEDs for power supply diagnosis

LED Meaning
Left green LED off Bus coupler has no power
Right green LED off No 24VDC power connected to the power contacts

LEDs for EtherCAT State Machine/PLC diagnosis

LED Display Status Meaning
RUN green off Init State of the EtherCAT State Machine: INIT = Initialization
blinking Pre-Operational State of the EtherCAT State Machine: PREOP = Pre-Operational
single flash Safe-Operational State of the EtherCAT State Machine: SAFEOP = Safe-Operational
on Operational State of the EtherCAT State Machine: OP = Operational
flashes Bootstrap State of the EtherCAT State Machine: BOOT = Bootstrap (Update of the coupler firmware)
ERROR red off - No errors
blinking Err-Operational
No Communication
PLC error / Lost frames

LEDs for fieldbus diagnosis

BK1120, BK1150

LED Display Status Meaning
LINK/ACT (X1 IN) green off - no connection with the previous EtherCAT client
on linked previous EtherCAT-client connected
blinking active communication with the previous EtherCAT client
LINK/ACT (X2 OUT) green off - no connection with the next EtherCAT client
on linked next EtherCAT client connected
blinking active communication with the next EtherCAT client

BK1250

LED Display Status Meaning
LINK / ACT green off - No connection/communication with E-Bus
blinking linked Connection/communication with E-Bus established

LEDs for K-Bus diagnosis

LED Display Status Meaning
I/O-RUN green off - K-Bus inactive
on - K-Bus active
LED red; I/O Error Error code argument Description Remedy
Persistent, continuous blinking EMC problems
  • Check power supply for overvoltage or undervoltage peaks
  • Implement EMC measures
  • If a K-Bus error is present, it can be localised by a restart of the coupler (by switching it off and then on again)
1 pulse 0 EEPROM checksum error Set manufacturer’s setting with the KS2000 configuration software
1 Code buffer overflow Insert fewer Bus Terminals. The programmed configuration has too many entries in the table
2 Unknown data type Software update required for the Bus Coupler
2 pulses 0 Programmed configuration has an incorrect table entry Check programmed configuration for correctness
n (n > 0) Table comparison (Bus Terminal n) Incorrect table entry
3 pulses 0 K-Bus command error - No Bus Terminal inserted
- One of the Bus Terminals is defective; halve the number of Bus Terminals attached and check whether the error is still present with the remaining Bus Terminals. Repeat until the defective Bus Terminal is located.
4 pulses 0 K-Bus data error, break behind the Bus Coupler Check whether the n+1 Bus Terminal is correctly connected; replace if necessary.
n Break behind Bus Terminal n Check whether the Bus End Terminal 9010 is connected.
5 pulses n K-Bus error in register communication with Bus Terminal n Exchange the nth Bus Terminal
14 pulses n nth Bus Terminal has the wrong format Start the Bus Coupler again, and if the error occurs again then exchange the Bus Terminal
15 pulses n Number of Bus Terminals is no longer correct Start the Bus Coupler again. If the error occurs again, restore the manufacturers setting using the KS2000 configuration software
16 pulses n Length of the K-Bus data is no longer correct Start the Bus Coupler again. If the error occurs again, restore the manufacturers setting using the KS2000 configuration software