Siemens SIMATIC NET PROFIBUS Instrukcja Obsługi Strona 202

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Description of the DP Functions, Data, and Error Codes
DP Base Programming Interface for CP 5613/CP 5614
202
C79000-G8976-C108-01
4.7.3 Structure of the Configuration Data
Overview of the Structure
The configuration data contain the range of the input and output data areas and
information on data consistency.
They consist of a sequence of data fields, each data field having one of two
alternative formats:
Confi
uration data
Data field 1
Data field 2
...
Data field n
Variant 1
ID byte
Variant 2
Special ID byte
1. Length byte (optional)
2. Length byte (optional)
Vendor-specific data
(optional)
The two data block variants can be distinguished by bits 4 and 5 of the first byte.
Length of the Configuration Data
The length of the configuration data is ideally 1 to 32. If necessary, however, up to
244 bytes are possible.
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