Limit Value - Delphin Expert Logger Manual

Expert Logger
Status D C (clock) Clr (clear)
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2
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4.11.6
Limit value
This software channel monitors the specified source channel. The result,
i.e. the output signal of the limit value channel, is "High" when the specified
alarm conditions are met.
The following forms of monitoring are available:
Mode
Overrun
Underrun
Band mon-
itoring
Band violation
Steady con-
dition
In addition, you can also set no triggering for wire-breaks at the source.
The setting is only for sources (sensors) which can have wire-break mon-
itoring.
For all input, either enter a fixed value (
nel
that delivers the value. It is possible to dynamically change the limit
values during measurement.
Threshold
Hysteresis
small fluctuations around the threshold value in the monitored signal.
Depending on switch direction, the hysteresis lies below the threshold (for
overruns) or above the threshold (for underruns). See images. The hys-
teresis is especially beneficial for small (noise) signals. The
offers an alternative.
Expert Logger Manual
Januar 2018
X X
↑
D
D H
X L
the value is above the specified range or above the
threshold
the value is below the specified range or below the
threshold
the value is outside the specified range (threshold ±
bandwidth)
the value is within the specified range (threshold ± band-
width)
values change by more than the bandwidth ​ d uring lag
time.
is the decisive value in monitoring.
: Hysteresis prevents the alarm being repeatedly activated for
Q
H L
L D
L D (transparent)
L Previous status
Alert when
Manual value
121
chan-
) or specify a
Delay
option
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