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Supplementary instructions PROFIBUS
1.7 Diagnostic messages
Diagnostic telegrams
0 0
1 0 1 1 0 0 0 0
0
0
0
0
0
user_data
22
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DP
In conformity with PROFIBUS
Get_Sl_Diag service. The diagnostics data comprise standard
diagnostics information (6 bytes according to PROFIBUS
standard) and any possible diagnostics data specific to the device.
A maximum of 63 bytes can be added for the device-specific diag‐
nostics data. The first 4 bytes in the PROFIBUS
specified from this:
Evaluate the sign_len byte as follows:
Length of the DU status including the header byte: 04..63
'device-related diagnostics' specification: 00 constant
Evaluate the status_type byte as follows:
Status type: 48 (manufacturer-specific)
'Status' specification: 1 constant
Evaluate the slot_number byte as follows:
0
0
0
Slot number: 0 (because only slot 0 is being used)
Evaluate the specifier byte as follows:
0 0
Status specification: 00 constant
Reserved
59 bytes subsequently remain freely available (user_data):
Errors are indicated using the user_data fields.
The user_data fields are each combined in blocks of 3 bytes and
are interpreted as follows:
1 - Services
2 - Error type
3 - Type of data access (read/write)
Thus up to 19 errors can be signalled.
standard, the device provides the
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standard are
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