09.2008 Communication / PROFIBUS
Siemens AG 6SE7087-6QX70 (Version AK)
SIMOVERT MASTERDRIVES Compendium Motion Control 8.2-13
The following illustration shows the telegram structure for data transfer
via the acyclical MSAC_C1 channel.
DP - Master
DP - Slave
Slot
number
Index Length Data
Function
number
Slot
number
Index Length
Function
number
Possibly several polling cycles without
data until reply with data
Call telegram
Reply telegram
DP - Master
DP - Slave
Slot
number
Index Length Data
Function
number
Slot
number
Index Length
Function
number
Possibly several polling cycles without
data until reply with data
Call telegram
Reply telegram
Write function
Read function
Fig. 8.2-5 Sequence of a Read and Write function
Telegram structure