IFM Electronic TAD 91 Series, Руководство по эксплуатации

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5.2.2 Sensor backup (redundancy switching)
If one of the two sensor elements fails (= diagnostic case 4 → 5.2.3 ), it is possible
to continue to measure the temperature with the other sensor element that is still
operational (sensor backup → 10 Fault correction ; Fnr 21)� However, drift monitor-
ing is not possible any more�
5.2.3 Diagnostic cases
Diagnostic case
Diagnostic messages
Warning Alarm Failure
1 Drift warning threshold [drW] exceeded
●
2 Limit temperature internal electronics
exceeded (+125°C)
●
3 Drift alarm threshold [drA] exceeded
●
4 Failure of one of the two sensor
elements
●
5 Measured temperature value far
outside the measuring range
●
6 Supply voltage outside the operating
range*
●
7 Drift failure threshold [drF] exceeded
(→ 5.2.1)
●
8 Error during parameter setting via
IO-Link
●
9
Failure of both sensor elements
or
general electronics problems
●
*Exception: For 2-wire operation no diagnostic message is provided in case of undervoltage
(→ 5.2.4) �
5.2.4 Diagnostic function in 2-wire operation
In 2-wire operation the analogue output is used for temperature measurement and
diagnostics�
With [drEd] the diagnostic cases to be signalled can be set via the analogue
output: