NAiS FP0-A80, Technical Manual

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FP0 A/D Converter Unit A/D Conversion Characteristics
3-6 Matsushita Electric Works (Europe) AG
3.3 Averaging Function for Voltage and Current Ranges
When the averaging function is set to on, the internal processing of the A/D conversion
unit is as shown in the diagram below (in this example there are two input channels, and
the input range setting switch Nos. 3 and 4 are off).
Operation item Time chart
Analog input
value for ch0
(Reading time)
ch1
1800
1ms
1ms
1ms
ch0
1780 1820 1790 1800 1850 1900 1830 1870 1910 1780 1810 1950
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
Internal process-
ing for A/D con-
version unit ch0
1800 1780 1820 1790 1800 1850 1900 1830 1870
(1800+1820+1790+1800+1850+1900+1830+
1870)
→
8=1832.50
min
1780 1820 1790 1800 1850 1900 1830 1870
(1820+1790+1800+1850+1900+1830+
1870+1780)
→
8=1830.00
min
1820 1790 1800 1850 1900 1830 1870
(1820+1790+1800+1850+1900+
1830+1870+1810)
→
8=1833.75
1790 1800 1850 1900 1830 1870
max
1810 1950
(1790+1800+1850+1900+
1830+1870+1910+1810)
→
=1845
1910
1910
max
1910
max min
1810
max
8
Averaging of results from 8 times, with
max/min values deleted.
deleted deleted
deleted deleted
deleted deleted
deleted
1780
1910
deleted
min
1780
1780
Digital output
value for ch0
K1832
K1830
K1833 K1845
Starting with the most recent data, the data from the last ten times is taken. The
maximum and minimum values are deleted, and the averaging is carried out on the
remaining eight items. The obtained values are output to WX2 and WX3. The values
output at this time always use the most recent averaged value (decimals are discarded).