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Profibus Communication
B.7 Diagnostics
If extended diagnostic messages (Ext_Diag_Data) exist, this is displayed by the "Diag_Flag" of
the "Data_Exchange" service. If the master then calls the "Slave_Diag" service, the external
diagnostic data are supplied in the following form by the device:
Table B-8
Byte
No.
1
2
3
4
5
6
7
8
The total length of the external diagnostic data is always 8 including the header.
The "Diag_Flag" is always set when something has changed in the last four bytes of the
diagnostic data (corresponds to the parameter "DIAGNOSIS") since the last message, i.e. even
when diagnostic messages disappear again so that the master can register every change in the
diagnostic data.
When a diagnostic message is active, the corresponding bit is set otherwise reset.
The following bits of the external diagnostic data are supported by SITRANS F M (all other bits
stay reset at all times):
Table B-9
Bit No.
0
1
2 ... 7
The "Error appears" message has priority over the "Error disappears" message, i.e. if one
diagnostic bit is set and another reset simultaneously, "Error appears" is reported.
The DIAGNOSIS part contains diagnostic messages of the device and has the following structure
(Bit 0 = LSB, Bit 7 = MSB):
Table B-10
Format of the diagnostic data, Byte 5 (=DIAGNOSIS Byte 1)
Bit No.
Description
0
DIA_HW_ELETR
4
DIA_MEM_CHKSUM
112
Format of diagnostic data
Profile designation
Header
Diagnosis
Byte 1
Byte 2
Byte 3
Byte 4
Format of the diagnostic data, byte 4
Description
Error appears
Reset
Reserved
Meaning
Hardware failure of the elec‐
tronic
Memory error
Value
8 (dec.)
(fixed) length of diagnostic data (number of bytes)
254 (dec.)
(fixed)
1
(fixed)
0 or 1
Display of changes in diagnostic data (see below)
(s. below)
Diagnostic information
--
(not supported)
--
(reserved)
(s. below)
Note on additional diagnostic data
At least one bit of the following 4 bytes (DIAGNOSIS)
was set
At least one bit of the following 4 bytes (DIAGNOSIS)
was reset
---
Cause (local message)
"Com.--Module failure"
Communications module cannot be addressed
Sensor failure (sensor failure)
"Measurement module failure"
Memory failure"
Operating Instructions, 03/2021, A5E00102775-AC
Meaning
Meaning
TRANSMAG 2 with MAG 911/E
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