Infoportal
Unterschiede
Hier werden die Unterschiede zwischen zwei Versionen angezeigt.
| Beide Seiten der vorigen RevisionVorhergehende Überarbeitung | Nächste ÜberarbeitungBeide Seiten der Revision | ||
| embedded_systems:ethercat:choose_linux_master [2019-02-08 14:37] – mgehrig2 | embedded_systems:ethercat:choose_linux_master [2019-02-13 12:41] – mgehrig2 | ||
|---|---|---|---|
| Zeile 1: | Zeile 1: | ||
| - | ====== 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 patch with the rt preempt patch to make the system real-time capable. | ||
| - | 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 | ||
| 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 //" | ||