KROHNE MFC 400 Profibus - Manual (Page 31)

COMMISSIONING / OPERATION
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MFC 400
www.krohne.com 06/2013 - 4002835301 - AD MFC 400 PROFIBUS R01 en
4.3 Diagnosis
The PROFIBUS device performs internal self-tests. The results are provided as detailed
diagnosis information according to PA Profile 3.02. This diagnosis information is available via
several parameters and can be read by an engineering tool (e.g. DD/DTM). In addition the
diagnosis information is transferred via cyclic services towards the control system (e.g. PLC).
Diagnosis is bitwise coded. Therefore it is possible to report more than one indication
simultaneously. The GSD file contains a text for each diagnosis bit in order to provide a text
message in the control system. The references are defined by the UNIT_DIAG_BIT(i) entries.
They show which bit is set to indicate a special diagnosis event.
The amount and content of the diagnosis information depends on the device configuration. The
active Ident. Number and the selected status and diagnosis mode will influence diagnosis
propagation. The following tables show the diagnosis events which are reported for different
settings. The bit number is equal to the counting within the GSD file. It represents the position in
the device-related diagnostic field of the Slave_Diag service.
INFORMATION!
Diagnosis to control system in case of
• Manufacturer specific Ident. Number (4512 hex)
• Manufacturer specific Ident. Number (4513 hex)
• Profile specific Ident. Number (9742 hex)
(these diagnosis events are contained in PROFIBUS parameter "DIAGNOSIS")
Bit N
u
mb
er
suppor
ted
Description Remedy
16 yes Error appears -
17 yes Error disappears -
24 1 Hardware failure electronics The device or measurement is defective and cannot measure.
Related output values are invalid. Typically a repair or
replacement of the device is required.
Check detailed diagnosis. Restart the device. If the error occurs
again: send the device back to the manufacturer with an
indication of the error.
29 1 Measurement failure The device or application condition is in a way that the
measurement accuracy may be reduced. But still the
measurement value follows the source. E.g. the device may be
operated outside its specified operating range.
Check detailed diagnosis. Restart the device. If the error occurs
again: send the device back to the manufacturer with an
indication of the error.
35 yes Restart Device is restarted because of power-up or warmstart request. In
case of unexpected restart: send the device back to the
manufacturer with an indication of the error.
36 yes Coldstart Device is reset to its Factory/Default settings because of a user
request or exchange of the basic module (serial number is
changed). Recover user specific parameter settings.