Siemens SITRANS F M TRANSMAG 2 Operating Instructions Manual page 100

Profibus Communication
B.6 Diagnostics
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
5 DIA_MEASUREMENT
Table B- 11 Format of diagnostic data, Byte 8 (=DIAGNOSIS Byte 4)
Bit No. Description
0 ... 6 reserved
7 EXTENSION_
AVAILABLE
The bits in DIAGNOSIS usually take over the function of a group message which can then
be split up in detail using the local messages.
The EXTENSION_AVAILABLE bits indicates that other diagnostic information is available,
basically details of the DIAGNOSIS message. This information is displayed locally.
Additionally, the measured value-related messages are transmitted cyclically with the
measured values in the status byte (Substatus).
98
Format of the diagnostic data, byte 4
Description
Error appears
Reset
Reserved
Meaning
Hardware failure of the
electronic
Memory error
Measurement failure
Meaning
---
More diagnosis
information is available
Meaning
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"
Flow measurement failure"
"Tube empty"
"Measuring range overflow"
Cause (local message)
More diagnosis information available (here:
Local messages see DIAGNOSIS--Byte 1)
Operating Instructions, 11/2009, A5E00102775-07
SITRANS F M TRANSMAG 2