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Profi
Message
Latch
Status D C (clock) Clr (clear)
Q
1
X
X
H
L
2
D
↑
L
D
2
D
H
L
D (transparent)
3
X
L
L
Previous status
4.7.6
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 con-
ditions are met.
The following forms of monitoring are available:
Mode
Alert when
Overrun
the value is above the specified range or above the
threshold
Underrun
the value is below the specified range or below the
threshold
Band mon-
itoring
the value is outside the specified range (threshold ± band-
width)
Band violation
the value is within the specified range (threshold ± band-
width)
Constancy
values change by more than the bandwidth
during lag
time.
In addition, you can also set no triggering for wire-breaks at the source. The set-
ting is only for sources (sensors) which can have wire-break monitoring.
For all input, either enter a fixed value (
Manual value
) or specify a channel that
delivers the value. It is possible to dynamically change the limit values during
measurement.
Threshold
is the decisive value in monitoring.
Hysteresis
: Hysteresis prevents the alarm being repeatedly activated for small fluc-
tuations 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 hysteresis is especially beneficial for
small (noise) signals. The
Delay
option offers an alternative.
100
Delphin Technology AG
Dezember 2015
Profi
Message Manual
Содержание ProfiMessage
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Страница 312: ...ProfiMessage 11 Appendix 11 1 ISO 9001 certificate 312 Delphin Technology AG Dezember 2015 ProfiMessage Manual ...
Страница 313: ...ProfiMessage 11 2 EC declaration on conformity 313 Delphin Technology AG Dezember 2015 ProfiMessage Manual ...
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