Hier werden die Unterschiede zwischen zwei Versionen angezeigt.
Beide Seiten der vorigen RevisionVorhergehende ÜberarbeitungNächste Überarbeitung | Vorhergehende Überarbeitung | ||
embedded_systems:ethercat:choose_linux_master [2019-02-08 14:37] – mgehrig2 | embedded_systems:ethercat:choose_linux_master [2023-04-11 11:20] (aktuell) – Urs Graf | ||
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- | ====== Choose a Linux Master | + | ====== Choose a Linux master |
===== Overview ===== | ===== Overview ===== | ||
The linux master is a PC with Linux installed. | The linux master is a PC with Linux installed. | ||
- | The kernel is patch with the rt preempt patch to make the system real-time capable. | + | The kernel is patched |
- | The EtherNet | + | The Ethernet |
Zeile 13: | Zeile 13: | ||
A time buffer, which is larger than the largest expected jitter, has to be used. | A time buffer, which is larger than the largest expected jitter, has to be used. | ||
- | If the time buffer is smaller, then in some cases the timing cannot be met and the data from this cycle is lost. | + | If the time buffer is too small, then in some cases the timing cannot be met and the data from this cycle is lost. |
The smaller this time buffer is, the more time is available for calculations on the master. | The smaller this time buffer is, the more time is available for calculations on the master. | ||
Zeile 19: | Zeile 19: | ||
A good real-time behavior enables a smaller time buffer. | A good real-time behavior enables a smaller time buffer. | ||
- | The minimum cycletime, and thus also the maximum frequency of the control loop, is mainly given by this time buffer plus the calculation time (EEROS). | + | The minimum cycletime, and thus the maximum frequency of the control loop, is mainly given by this time buffer plus the calculation time (EEROS). |
TODO graphic time management on master | TODO graphic time management on master | ||
- | See [[software: | + | See [[software: |
[[software: | [[software: | ||
Zeile 58: | Zeile 58: | ||
Check with your contact from Acontis if this ethernet controller is suitable for one of there link layers. | Check with your contact from Acontis if this ethernet controller is suitable for one of there link layers. | ||
- | Check chapter 2.3.1.3 of the Acontis {{: | + | Check chapter 2.3.1.3 of the Acontis {{: |
The //" | The //" |