Siemens SITRANS F M Intermag 2, Operating Instructions Manual

Page: 97 / 130

Operation
5-49
SITRANS FM Intermag 2 Flow Transmitter
Operating Manual - A5E00102775-03
5.4.3 Diagnostics
The diagnostic data can be requested with the ”Slave_Diag” service.
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:
Byte
Profile designation Value Meaning
y
No.
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
g
Byte 2 -- (not supported)
7 Byte 3 -- (reserved)
8 Byte 4 (s. below) Note on additional diagnostic data
Table 5-12 Format of 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 FM (all other bits stay reset at all times):
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 ---
Table 5-13 Format of the diagnostic data, byte 4
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.