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3.1.4. DP user data
With PROFIBUS, process data are exchanged cyclically between
master and controller in the user-data phase. In addition to the
process data you can activate a DP parameter setting channel
which will use the first 8 byte of the user data. The data structure is
the same for input and output data, see following tables.
Data structure of user data
Byte
no.
with parameter setting
channel
1Service
2 Subindex Parameter setting
3 Index (High-Byte) channel
4 Index (Low Byte)
5 Data/Error-Byte 1
6 Data/Error-Byte 2
7 Data/Error-Byte 3
8 Data/Error-Byte 4
9 PIW1/POW 1 (High-Byte)
10 PIW1/POW 1 (Low-Byte) Process data
11 PIW2/POW2 (High-Byte)
12 PIW2/POW2 (Low-Byte)
Byte
no.
without parameter setting
channel
1 PIW1/POW 1 (High-Byte)
2 PIW1/POW 1 (Low-Byte) Process data
3 PIW2/POW2 (High-Byte)
4 PIW2/POW2 (Low-Byte)
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