HBM PX401, Operating Manual

Page: 188 / 552

Internal calculation channels
188
A4354-2.2 HBM: public
PMX
13.2.2.3 Extreme Value (Peak)
Function This calculation determines the minimum, maximum or
oscillation width (peak-to-peak) value of a signal. You can also
determine the value of another channel (Input 2) when an
extreme value is reached. If you specify a discharge time
constant, you will obtain an envelope function.
Additionally, a new peak is signalled by an output flag. The
flag only is high in the cycle, in which a new peak was
detected. When the input signal increases constantly, the
output flag of a maximum peak block is permanently high.
Reset via (virtual) digital input or Flag (level­controlled)
Reset via fieldbus (event­controlled)
Hold via digital input (level­controlled)
This function block may deliver wrong values after its creation
or after switching of the parameter set. It is strongly
recommended to reset the extreme value before starting the
process.
The maximum or peak­to­peak value decreases with the
discharge rate.
The minimum value increases with the discharge rate.
Small discharge rates can cause numerical issues. Please
compare the discharge rate with the expected peak values.
Discharge rate > 5% of peak value: No issue expected.
Discharge rate 1% ... 5% of peak value: Please check whether
the value discharges as expected.
Discharge rate < 1% of peak: Critical. The value may not
discharge as expected.
Inputs - Input 1
- Input 2
-
Hold with
- Reset by