Error Handling And Diagnostics; El6751 - Led Description - Beckhoff EL6751 Documentation

6

Error handling and diagnostics

6.1 EL6751 – LED description
Fig. 134: LEDs
LED behavior
The most important states of the terminal can be quickly diagnosed on the basis of the LEDs:
LED Color Meaning
RUN green This LED indicates the terminal's operating state:
off
Flashes at 2 Hz
Flashes at 1 Hz
on
Err red off
Flashes at 1 Hz
Flashes at 10 Hz
on
CPU er- red on
ror
Flashes at 10 Hz
EL6751
State of the EtherCAT State Machine:
INIT = initialization of the terminal;
BOOTSTRAP = function for terminal firmware updates
State of the EtherCAT State Machine:
PREOP = function for mailbox communication and different standard-settings set
State of the EtherCAT State Machine:
SAFEOP = verification of the sync manager channels and the distributed clocks.
Outputs remain in safe state
State of the EtherCAT State Machine: OP = normal operating state; mailbox and process data
communication is possible
All configured bus devices are error-free (box state = 0); TwinCAT task or process is running.
At least one box state is not equal to 0 (e.g. device not found, wrong configuration, device in
error state)
Configuration upload being carried out
CAN controller is BUS OFF. Physical CAN problem. Possible causes: e.g. missing termination
resistor, bus line too long, wrong baud rate, node address assigned twice, wiring error, short-
circuit.
Restart required
EL6751 processor error
The EL6751 processor starts
Version: 3.5
Error handling and diagnostics
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