2. Commissioning
2-19
Festo P.BE-CTEU-EC-OP+MAINT-EN en 1208NH
2.1.5 A d d ressing and data a ccess (data objects)
Addressing
The higher-order controller is responsible for addressing the
individual modules: the EtherCAT master determines the
position of the EtherCAT devices within the network.
Block-oriented addressing (i.e. not module-oriented
addressing as used by other fieldbus systems) is used.
Alternatively, the CTEU-EC bus node can be assigned an
EtherCAT address usi ng the DIL switches ( section 1.4.5).
To activate the defin ed hardware address, the following
setting must be made e.g. in the TwinCAT configuration tool
EtherCAT Advanced settings General
Identi fi cation Use Configured Station Ali as (0x0012).
The controll er uses the foll o w i ng for local addressing:
– The physical position of the device in the EtherCA T
network (“ auto increment address”)
– An independent EtherCAT device address (“EtherCAT
address”)
The EtherCAT device address can be changed using the con-
figuration tool if necessary.
Data a ccess (data obj ects)
Internal EtherCA T data are accessed via protocol-specific data
objects (based on the CANopen fieldbus protocol).
EtherCAT devices (I/O devices) have an object directory which
makes all the key participant parameters accessible in a
standardised way. An EtherCA T system is configured mainly
by accessing the object directory of the individual parti-
cipants.
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