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4. Setting up the device
This device has 4 virtual alarms that can monitor one limit value in regard of an undercut or
exceedance. Each alarm can be allocated to an optional relay output S1-S2; furthermore
alarms can be controlled by events like e.g. Hold or Min-/Max-value.
Function principle of alarms / relays
Operating current / Quiescent current
Working principle
Broadness of the window between the switching thresholds
Hysteresis
Threshold / limit value of the change-over
Switching threshold
Deactivated, instantaneous value, Min-/Max-value, Hold-value,
totaliser value
Alarm / Relay x
4.4. Alarms / Relays
Operating current
By operating current the alarm S1-S2 is
off below the threshold and on on
reaching the threshold.
Quiescent current
By quiescent current the alarm S1-S2 is
on below the threshold and switched off
on reaching the threshold.
Switching-on delay
The switching-on delay is activated via
an alarm and e.g. switched 10 seconds
after reaching the switching threshold, a
short-term exceedance of the switching
value does not cause an alarm,
respectively does not cause a switching
operation of the relay. The switching-off
delay operates in the same way, keeps
the alarm / the relay switched longer for
the parameterised time.
