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Functions
9.17 Diagnostics
9.17
Diagnostics
9.17.1
Diagnostic functions
The diagnostic concept of the SITRANS TH200 and the SITRANS TH300 envisages that a
diagnostic warning can be set in the parameters for diagnostic functions that are used for
monitoring limit values. A diagnostic interrupt can be set in the parameters for diagnostic
functions that are used for monitoring error conditions.
Diagnostics interrupts
Diagnostics interrupts can be output via:
● Analog output
● Operating indicator (LED)
● Only in SITRANS TH300: HART communication
The device goes into the alarm current state. In addition, the diagnostic event is made
available via the operating software. The following table summarizes all the diagnostic
functions that can be set in the parameters. If multiple errors occur simultaneously, the
priority settings apply. Priority 1 is the highest priority.
Diagnostic function
1)
2)
3)
60
Hardware/firmware defect
RAM/ROM error
Flash/EEPROM error
Watchdog error
Electronics defect (hardware/firmware)
Electronics temperature outside limit
Undershoot of min. supply voltage
Sensor error
Sensor breakage
Sensor short circuit
Measured value (PV) outside the sensor
limit
3)
Only in TH300
A diagnostics interrupt is not triggered unless the measured value is higher or lower than
the limit value by 3 °C (5.40 °F).
A diagnostics warning is triggered immediately when the measured value exceeds the
limit value. The diagnostic interrupt is triggered in any case if the limit value is exceeded
by more than 2%.
Priority
HART
1
Status
1
Status
1
Status
1
Status
1
Status
2)
1
-
2
Status
2
Status
2
Status
Operating Instructions, 06/2010, A5E00393069-03
Analog output
LED
1)
On alarm value
Red
On alarm value
Red
On alarm value
Red
On alarm value
Red
On alarm value
Red
< 3.6 mA
Red
On alarm value
Red 2
On alarm value
Red 2
On alarm value
Red 2
SITRANS TH200/TH300
Hz
Hz
Hz
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