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Beckhoff PROFIBUS User Manual Page 25

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PROFIBUS
Feldbus Box für PROFIBUS 23
Protokollbeschreibung
Prozessdaten
Nachdem die Parameterdaten und auch die Konfigurationsdaten fehlerfrei empfangen und bestätigt wurden , geht
der Slave in den Zustand Data_Exch, d.h. er tauscht Daten mit dem Master aus. Der Master sendet die
Ausgangsdaten und der Slave antwortet mit den Eingangsdaten.
Konfigurationsdaten (Cfg Data)
Nach dem Parametrieren sendet der Master ein Konfigurationstelegramm an den Slave. Das
Konfigurationstelegramm veranlasst den Slave, die vom Master gesendeten Konfiguration zu prüfen.
Aufbau eines Konfigurationsbytes
Bit 0..3 Länge der Daten
00 = 1 Byte/Word
15 = 16 Byte/Word
Bit 4..5 Ein-/Ausgabe
00 = spezielles Kennungsformat
01 = Eingabe
10 = Ausgabe
11 = Ein/-Ausgabe
Bit 6 Byte/Word
0 = Byte
1 = Word
Bit 7 Konsistenz
0 = Konsistenz über Byte/Word
1 = Konsistenz gesamte Länge
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