NAiS FP Series, Hardware Manual

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FP0 Hardware 4.7 Averaging Function
4-17 Matsushita Electric Works (Europe) AG
4.7 Averaging Function
4.7.1 Averaging for Voltage Ranges and Current Ranges
When the input range is set to a voltage range or current range, processing like that
shown below is carried out internally by analog I/O unit.
Operation
item Time chart
Analog input
value for ch0
125mV (0 to 5V range)
2.3V (0 to 5V range)
Reading
time
1m
sec 1m
sec
18msec
ch1
1870 1830 1900 1850 1800 100 110 90 100
1950 1810 1780
ch0
ch1
ch0
ch1
ch0
ch1
ch0
ch1
ch0
ch1
ch0
ch1
ch0
ch1
ch0
ch1
ch0
ch1
ch0
ch1
ch0
ch1
ch0
ch1
ch0
ch1
ch0
ch1
ch0
ch1
ch0
ch1
ch0
ch1
ch0
1m
sec 1m
sec
1910
Internal
processing
for analog
I/O unit ch0
1800 100
min
1850 1900 1830 1870 1780 1810
1800 100
min
1850 1900 1830 1870 110
100 1800 90
min
100 1910
max
(100+110+100+1800+1850+1900+1830+
1870)
÷
8=1195
(110+100+1800+1850+1900+1830+
1870+1780)
÷
8=1405
(110+1800+1850+1900+1830+
1870+1780+1810)
÷
8=1618.75
(1800+1850+1900+1830+
1870+1910+1780+1810)
÷
8
=1843.75
1850 1900 1830 1870 110
1800 90
min
100 1910
max
1850 1900 1830 1870 110
1910
max
1780
1950
max
1910
1780
1810
Averaging of results from 8 times,
with maximum/minimum values deleted
Digital
output value
for ch0
18msec
K1195
K1618
K1405
K1843
Starting with the most recent data, the data from the last ten times is taken. The
maximum and minimum values are deleted, and then averaging is carried out on the
remaining eight items. The value obtained from the most recent averaging is normally
used as the value output at this time. (If a fraction results from the calculation, it is
rounded off.)