VIPA 238-2BC00 - Page 47

Manual VIPA System 200V Chapter 2 Analog input modules
HB97E - SM-AIO - Rev. 12/32 2-23
Mean value evaluation
Mean value function 2 of 3 values:
After every measuring, the module evaluates the mean value of the last 3
binary values. The value most different from the mean value is deleted and
another mean value evaluated from the remaining 2 values. This value is
monitored.
Mean value function 4 of 6 values:
After every measuring, the module evaluates the mean value of the last 6
binary values. The 2 values most different from the mean value are deleted
and another mean value evaluated from the remaining 4 values. This value
is monitored.
Envelope function
The output valued is "wrapped" with an envelope. If the measured value
over- res. underruns the envelope, the envelope migrates accordingly. The
output value is the mean value of the envelope.
The following sample illustrates this:
Measured
Value
Output value
(Mean value evaluation
of envelope function)
Integration time
+8/+16
-8/-16
1 2
3
Envelope
function:
1
Measuring value within envelope → no envelope shift, Output is mean value of the current
envelope upper and lower limit.
2
Measuring value oversteps the envelope → Envelope shift up for the difference between
"old" envelope upper limit and measuring range, output value is the mean value of the
"new" envelope upper and lower limit.
3
Measuring value shortfalls the envelope → Envelope shift down for the difference between
"old" envelope lower limit and measuring range, output value is the mean value of the "new"
envelope upper and lower limit.