Siemens SIMATIC NET PROFIBUS Instrukcje Operacyjne Strona 358

  • Pobierz
  • Dodaj do moich podręczników
  • Drukuj
Przeglądanie stron 357
Infrared Link Modul (ILM)
6ZB530–3AC30–0BA1
16
Copyright by Siemens
5.2.2 PointtoMultipoint Link
Instead of the multiple use of point-to-point links, the point-to-multipoint link can also be used. Optical isolation
between the infrared transmission links is not necessary. If the configuration is correct, only one slave node
responds to the request of a master node and because there is only one PROFIBUS ILM on the master
network segment, there are no synchronization problems with the response.
The advantage of this arrangement is that with n slave segments only n)1 PROFIBUS ILMs are required.
The disadvantages of this arrangement are not only the restrictions in the arrangement of the slave PROFIBUS
ILMs to a solid angle of )/–10 degrees but also from the point of view of the master PROFIBUS ILM the
poorer monitoring of the link because the acknowledgment pulse mechanism cannot be used (see Section
5.6.2).
Przeglądanie stron 357
1 2 ... 353 354 355 356 357 358 359 360 361 362 363 ... 489 490

Komentarze do niniejszej Instrukcji

Brak uwag