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Appendix |EtherCAT Documentation
confocalDT 24x1
A 6.6
Oversampling
The last arised measurement value data record is transmitted to EtherCAT Master with
each fieldbus cycle during operation without oversampling. Many measurement value
data records are not available therefore for large fieldbus cycle times. All (or selectable)
measurement value data records are collected with the configurable oversampling and
are transmitted together to the master with the next fieldbus cycle.
Example:
The fieldbus/EtherCAT is operated with a cycle time of 1 ms, because, for example the
PLC is operated with 1 ms cycle time. For this reason an EtherCAT frame is sent to the
IFC24x1 for collection of process data every 1 ms. If the measuring rate in IFC24x1 is set
to 10 kHz, an oversampling of 10 should be set.
Procedure:
Select the measuring data to be set in the object 0x21B0 (Digital interfaces) in pre-
oparational state, for example
- “Distance 1 Ethernet/EtherCAT“ (is always selected and not deselected)
- “Value counter Ethernet/EtherCAT“
Then read the object directory from the IFC24x1.
Select another input as
All Objects
(e.g.
Mappable Objects (TxPDO))
in the
Advanced Settings
dialog and then select
All Objects
.
Otherwise, it may be, that TwinCAT only reads the values of the objects already known to
it. This is important for the next steps, because the
Mapping
(objects 0x1A00, 0x1A01,
… and 0x1C13) has changed.
