Status Messages - Siemens SITRANS LG250 Operating Instructions Manual

Echo curve memory
62
Event types are, for example, parameter modifications, status and
error messages as well as switch on and switch off times. The data
remain also in case of voltage interruption.
The data are read out via a PC with PACTware/DTM or the control
system with EDD.
The echo curves are stored with date and time and the corresponding
echo data. The memory is divided into two sections:
Echo curve of the setup: This is used as reference echo curve for
the measurement conditions during setup. Changes in the measure-
ment conditions during operation or buildup on the sensor can thus
be recognized. The echo curve of the setup is stored via:
•
PC with PACTware/DTM
•
Control system with EDD
•
Display and adjustment module
Further echo curves: Up to 10 echo curves can be stored in a ring
buffer in this memory section. Further echo curves are stored via:
•
PC with PACTware/DTM
•
Control system with EDD
•
Display and adjustment module

10.3 Status messages

The instrument has self-monitoring and diagnosis according to
NE 107 and VDI/VDE 2650. Status messages are outputted on the
device status. Detailed messages are visible under diagnosis via
DTM, display and adjustment module and EDD. The messages are
divided into the following categories:
Failure: Due to a malfunction in the instrument, a failure message
is outputted. This status message is always activated and cannot be
deactivated.
Function check: The instrument is in operation, the measured value
is temporarily invalid (for example during simulation). This status mes-
sage is always activated and cannot be deactivated by the user.
Out of specification: The measured value is unstable because the
instrument specification is exceeded (e.g. electronics temperature).
This status message is always inactive and can be activated via DTM
and EDD. The error codes and text messages are dispayed via the
indicating and adjustment module as well as DTM and EDD in the
control system. Additional information on error statstics is displayed
in the menu Diagnosis under "Device status" in the indicating and
adjustment module as well as in the DTM and EDD.
Maintenance: Due to external influences, the instrument function
is limited. The measurement is affected but the measured value is
still valid. Plan instrument for maintenance because failure must be
expected in the near future (for example due to buildup). This status
message is always inactive and can be activated via DTM and EDD.
The error codes are dispayed via the indicating and adjustment
module as well as DTM and EDD in the control system. Additional in-
formation on error statstics is displayed in the menu Diagnosis under
SITRANS LG250 - Operating Instructions PBD-51041388