Measured value
Limit value
transgression
Upper
limit value
"Hysteresis"
t
t
"Hysteresis“
Lower
limit value
A0009_GB
Fig. 66: Hysteresis
If the relays are defined as limit relays, they will also switch to the alarm relay when a
limit is transgressed and the direction of the limit transgression will be shown on the dis‐
play by the symbols
or .
Different on-delays (∆t On) and fall-delays (∆t Off) can be set for the limit relays for limit 1
and limit 2. These prevent the limit relay from switching back and forward if the limit is
only exceeded for a short time (damping function).
If there are no limit relays, the limits can nevertheless be entered. The DULCOMETER
®
D1Cb / D1Cc shows the reactions described when a limit is transgressed
Limit relay used as an actuator
If the relays are defined as actuators, then they react like actuating outputs. Example: in
the event of Pause being activated or in the event of an alarm, an activated limit relay will
be deactivated.
Operating Menus Independent of Measured Variables
124
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