Siemens SITRANS P DS III Operating Instructions Manual page 142

Operating functions through HART
7.23 Limit monitor
Hysteresis
Response time
Stop time
Figure 7-19 Trip levels for the limit monitor
You can count the limit violations for each limit monitor by activating an event counter that
provides separate, cumulative totals of upper and lower limit violations. A diagnostic warning
and / or a diagnostic interrupt can be issued once a certain number of violations is reached,
a number which you can also program. You can program the following values for the event
counter:
Table 7- 6 Parameters of the event counter
Event counter: upper limit
Event counter: lower limit
Comparison value: upper limit
Comparison value: upper limit
Limit monitoring, warning/interrupt: upper limit
Limit monitoring, warning/interrupt: lower limit
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Operating point for chatter suppression in the case of small pressure
changes.
The time which must pass after the limit is violated before this violation
is registered.
The time for which a limit interrupt or warning will always be sustained
even when the event which triggered it is no longer present.
Select here whether a warning or a warning plus an interrupt should be
triggered when the comparison value is exceeded.
Select here whether a warning or a warning plus an interrupt should be
triggered when the comparison value is not met.
Specify here the number of overflows at which a warning or a warning
plus an interrupt should be triggered.
Specify here the number of underflows at which a warning or a warning
plus an interrupt should be triggered.
Select whether a warning or a warning plus an interrupt should be
triggered when the event counter upper limit is violated.
Select whether a warning or a warning plus an interrupt should be
triggered when the event counter lower limit is violated.
SITRANS P DS III with HART
Operating Instructions, 06/2013, A5E00047092-09