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
-
M
ast
er
DP
-
S
lave
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
-
M
ast
er
DP
-
S
lave
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