4 error scenario (example), Error scenario (example), Control technology | ethercat communication manual – Lenze EtherCAT control technology User Manual
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Control technology | EtherCAT communication manual
Diagnostics
Diagnostics with the »PLC Designer«
11.2.4
Error scenario (example)
A slave is switched off or removed from the bus system while the system is in operation.
During operation, the master cyclically sends EtherCAT commands to read the process data
from the slave and to write process data to the slave. The working counter (WKC) is
incremented by the corresponding value through the slaves.
When a slave is switched off or removed, the master generates the
EC_NOTIFY_CYCCMD_WKC_ERROR notification to indicate such an event.
The slave can be re-commissioned by calling the function block SMC_ResetAxisGroup
(SM_DriveBasic.lib function library) or by a bus restart within the PLC program . (The
distributed clocks are synchronised and the EtherCAT bus is in the Operational state.)
Bus restart
Since the SMC_ResetAxisGroup function block cannot be used in logic systems, you must
program a bus restart in your PLC program. A bus restart is executed through call sequence
of the following function blocks:
1.
2.
3.
For a more detailed analysis of a problem, function blocks (see
), EtherCAT parameters (see
) and the IPC logbook
are available.