18 Outputs FLUXUS F70x
UMFLUXUS_F7V4-6-2EN, 2017-10-01 159
18.6.3 Defining the Hysteresis
A hysteresis can be defined for the alarm output R1 to prevent a constant triggering of the alarm due to small fluctuations
of the measured values around the limit.
The hysteresis is a symmetrical range around the limit. The alarm will be activated if the measured values exceed the up-
per limit and deactivated if the measured values fall below the lower limit.
18.7 Behavior of the Alarm Outputs
18.7.1 Apparent Switching Delay
Measured values and totalizer values will be displayed rounded to two decimal places. The limits, however, will be com-
pared to the non-rounded measured values. This might cause an apparent switching delay when the measured value
changes marginally (less than two decimal places). In this case, the switching accuracy of the output is greater than the
accuracy of the display.
18.7.2 Reset and Initialization of the Alarms
After an initialization, all alarm outputs will be initialized as follows:
Press key C three times during the measurement to set all alarm outputs to the idle state. Alarm outputs whose switching
condition is still met will be activated again after 1 s. This function is used to reset alarm outputs of the type HOLD if the
switching condition is no longer met.
By pressing key BRK, the measurement will be stopped and the main menu selected. All alarm outputs will be de-ener-
gized, independently of the programmed idle state.
18.7.3 Alarm Outputs During Transducer Positioning
At the beginning of the transducer positioning (bar graph display), all alarm outputs switch back to the programmed idle
state.
If the bar graph is selected during the measurement, all alarm outputs will switch back to the programmed idle state.
An alarm output of the type HOLD that has been activated during the previous measurement will remain in the idle state af-
ter the transducer positioning if the switching condition is no longer met.
Switching of the alarms into the idle state will not be displayed.
Example: High Limit:: 30 m³/h
Hysterese: 1 m³/h
The alarm will be triggered at values > 30.5 m³/h and deactivated at values < 29.5 m³/h.
switching condition:
MIN or MAX
Enter the value for Hysterese.
or
Enter 0 (zero) to work without a hysteresis.
Press ENTER.
Tab. 18.5: Alarm state after an initialization
func OFF
typ NON-HOLD
mode NO Cont.
Limit 0.00
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