Communication
102
PROFIBUS SD2 telegram for SAP 51
The Read/Write service uses a variable-length PROFIBUS SD2
telegram shown below.
Figure 10. PROFIBUS SD2 telegram for SAP 51
DP header DP trailer
SD LE LEr SD DA SA FC DSAP SSAP DU FCS ED
68h x x 68h xx xx x xx xx x… xx 16h
SD = Start Delimiter
LE = Length
LEr = Length repeated
DA = Destination Address
SA = Source Address
FC = Function Code
DSAP = Destination Service Access Point
SSAP = Source Service Access Point
DU = Data Unit for DP services
FCS = Frame Checking Sequence
ED = End Delimiter
Data unit
DP-V1 Command/Response PROFIdrive V3 Parameter Channel
DU0 DU1 DU2 DU3
Request/Response header
(see Table 11/12 below)
Data
Byte Meaning Value
DU0 Function number See Table 8 below
DU1 Slot number
0 = Module itself
1 = Drive parameter access
DU2 Index 47 (0x2F)
DU3 Data length (Depends on type of message)
DU4…DUn PROFIdrive data
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