Siemens SIMATIC NET PROFIBUS Manuale di Servizio Pagina 177

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Description of the DP Functions, Data, and Error Codes
DP Base Programming Interface for CP 5613/CP 5614
C79000-G8976-C108-01
177
4.6.1 Overview of the Entire Structure
Possible Length
The typical length of diagnostic data is between 6 and 32 bytes. The maximum
possible length is 244 bytes.
Header and up to Three Following Fields
Diagnostic data have a fixed header and up to three further fields:
Header
Always exists,
fixed length
Device-related
diagnostics
Optional,
variable length
ID-related diagnostics
Optional,
variable length
Channel-related
diagnostics
Optional,
variable length
Identification of the Optional Parts
At the beginning of the optional parts there is a unique coding to distinguish one
part from another.
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