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Diagnostic alarm: The device goes into the alarm current / alarm voltage state.
The diagnostic event is provided additionally via HART. The output via the
message relay is parameterizable.
Table 1 gives a list of all parameterizable diagnostic functions. The standard setting
for all warnings and alarms is off. The diagnostic warning and diagnostic alarm must
be parameterized with the HART communicator or with SIMATIC PDM. If several
errors occur simultaneously, the given priorities apply (priority 1 = highest priority)
Diagnostic function
Diagnostic alarm:
1) 2)
Sensor error
Sensor break
Sensor short-circuit
Hardware / firmware error
RAM / ROM / EEPROM error
Checksum error
Electronic error
Enter special characteristic!
Diagnostic warning
Measured value below lower limit
Measured value above upper limit
Output saturation warning
Measured value below sensor limit
Measured value above sensor limit
Table 1
Diagnostic functions
1)
Output to message relay optional activation and deactivation of output in the Limit value mode menu
item
2)
Output to analog output Output can only be controlled by global activation and deactivation of the
break and short-circuit detection
3)
Output to analog output Parameterization not possible, the analog output is always set to alarm value
in the event of an error
4)
Time delay for response of the message relay is programmable
5)
Flashing starts with a time delay (time delay is the same as was programmed for the message relay)
SITRANS TW
A5E00054075-05
Priority
1
1
1) 3)
1
1
1
1
1)
2
1)
2
1)
3
4
4
Functions / Operation by HART
Output of diagnostic function via
Analogoutput Message
HART
Status
to alarm value
Status
to alarm value
Status
to alarm value
Status
to alarm value
Status
to alarm value
Status
to alarm value
Status
unchanged
Status
unchanged
Status
unchanged
Status
unchanged
Status
unchanged
4)
relay
LED
yes
f = 1Hz
yes
f = 1Hz
yes
f = 1Hz
yes
f = 1Hz
yes
f = 1Hz
no
f = 1Hz
5)
yes
f = 5Hz
5)
yes
f = 5Hz
5)
yes
f = 1Hz
no
f = 1Hz
no
f = 1Hz
109
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