Balluff BTL5-T110 Technische Beschreibung Seite 71

BTL5-T110...
Configuration and Profibus Connection –
Transducer Class 3/4
6 Startup (cont.)
If processing was successful, the message appears as follows:
Byte
Data type
number
0 Unsigned8
1 Unsigned8
2 Unsigned8
3 Unsigned8
Table 6-7: Structure of the DU for a positive Write.res
6.3.2.2 Description of the write
telegram Read.req
Read.req is used to request the
results of a process that was
initiated by Write.req. The result is
sent back in the Read.res.
Read.req is usually sent by the
master automatically and only the
Read.res must then be evaluated.
Byte 0 Byte 1
SD LE
68h X
Table 6-8: Message structure of Read.req
24
english
Meaning Description
Each service is
DP request assigned exactly one
function code.
Slot
Index
Length of the
Length message to be
written.
Byte 2 Byte 3 Byte 4
LEr SD DA
X 68h 8h
Value
0x5F = Write
0
47
Byte 5 Byte 6 Byte 7
SA FC DSAP
8h X 30h
Byte 8 Byte 9..n-2 Byte n-1
SSAP DU FCS
see
Tab. 6-9:
Structure
32h X
of the DU
in
Read.req
Byte n
ED
16h