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Appendix| EtherCAT
optoNCDT 2300
A 7.5 Measurement Data Formats
Measurement values
- Exposure time (1 x 32 bit)
- Measurement value counter (1 x 32 bit)
- Time stamp (1 x 32 bit)
- Displacement values / Intensities (n * ((i+1) * 2) x 32 bit)
- Status (1 x 32 bit)
- Differences ((n-1) x 32 bit)
- Statistic values (Min/Max/Peak2Peak) (per 32 bit)
n = 1 ... 2
For n = 1: Displacement measurement (diffuse / direct reflection)
For n = 2: Difference = Thickness (direct reflection)
i = 0 / 1
für i = 0: Intensity output is off
für i = 1: Intensity output is on
The distance values are output in nanometers. You will find further details on the structure of the measuring values in data format, see
Chap. 8.2.2.
A 7.6 ILD2300 with Oversampling in EtherCAT
Objects 1A00h…1A63: TxPDO Mapping
Object 1C13: TxPDO assign
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 ILD2300 for collection of process data every 1 ms. If the measuring rate in ILD2300 is set to
10 kHz, an oversampling of 10 should be set.
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