Siemens SITRANS F TRANSMAG 2, Руководство по эксплуатации, Страница: 112 / 126

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 Format of diagnostic data
Byte
No. Profile designation Value Meaning
1 Header 8 (dec.) (fixed) length of diagnostic data (number of bytes)
2 254 (dec.) (fixed)
3 1 (fixed)
4 0 or 1 Display of changes in diagnostic data (see below)
5 Diagnosis Byte 1 (s. below) Diagnostic information
6 Byte 2 -- (not supported)
7 Byte 3 -- (reserved)
8 Byte 4 (s. below) Note on additional diagnostic data
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 Format of the diagnostic data, byte 4
Bit No. Description Meaning
0 Error appears At least one bit of the following 4 bytes (DIAGNOSIS)
was set
1 Reset At least one bit of the following 4 bytes (DIAGNOSIS)
was reset
2 ... 7 Reserved ---
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 Meaning Cause (local message)
0 DIA_HW_ELETR Hardware failure of the elec‐
tronic "Com.--Module failure"
Communications module cannot be addressed
Sensor failure (sensor failure)
"Measurement module failure"
4 DIA_MEM_CHKSUM Memory error Memory failure"
Profibus Communication
B.7 Diagnostics
TRANSMAG 2 with MAG 911/E
112
Operating Instructions, 03/2021, A5E00102775-AC