2. Commissioning
2-20
Festo P.BE-CTEU-EC-OP+MAINT-EN en 1208NH
The access mechanism is provided by Ser vice Data Obj ects
(SDOs).
There are two di fferent co mmunicati o n mech ani sms in an
EtherCAT system.
P
rocess Data Obj ects (PDO) provi de fast transfer of process
data and are transmitted by simple EtherCAT messages with
no protocol overhead. Process Data Objects can be transmit-
ted based on event control, synchronised to a system clo ck,
or on request.
The S
ervice Data Objects (SDO) form a point-to-point connec-
tion and permit access to every entry in the object directory
of a node.
Access these data objects with the help of user programs
created according to your specific requirements.
Caution
Danger of malfunction s, damage or personal injury
A valve terminal will be put into operation even if it is in-
correctly configured.
•
Before co mmissioni ng, ensure that the connected ele-
ments (e.g. actuators) do not perform any unexpected or
uncontrollable movements.
•
If necessary, disconnect the load power supply and com-
pressed air supply.
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