Beckhoff EL9930 Operating Instructions Manual page 27

LED display EtherCAT status
flashing PreOP
single flash SafeOP
on OP
EL9930
Description
Function for mailbox communication and different default settings set.
Verification of the Sync Manager channels and the distributed clocks.
The outputs remain in safe state.
Normal operating state; mailbox and process data communication is
possible.
Version: 2.0.0
Operation
27