Beckhoff CX B110 Series Manual page 25

Parameterization and commissioning
Operational (Op)
Before the EtherCAT master switches the EtherCAT Slave from Safe-Op to Op, it must transmit already valid
output data. In the Op state the slave copies the output data of the master to its outputs. Process data and
mailbox communication is possible.
Boot
In the Boot state the slave firmware can be updated. The Boot state can only be reached via the Init state. In
the Boot state mailbox communication is possible via the File-Access over EtherCAT (FoE) protocol, but no
other mailbox communication and no process data communication is possible.
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