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7. Alarms / Relays
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-S4; furthermore alarms can be controlled by events like
e.g. hold or min/max-value.
Function principle of alarms / relays
Alarm / Relay x
Deactivated, instantaneous value, min/max-value, hold-value, totaliser
value, sliding average value, constant value, difference between
instantaneous value and constant value or an activation via the digital
input or via the
[O]-key
.
Switching threshold
Threshold / limit value of the change-over
Hysteresis
Broadness of the window between the switching thresholds
Working principle
Operating current / Quiescent current
7. 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.
