95
CHAPTER 8 FUNCTIONS
8
8.6 A/D C
onversion Me
thod
8.6
A/D Conversion Method
Set whether to perform sampling processing or averaging processing for each channel.
(1) Sampling processing
This processing performs A/D conversion on analog input values in sequence. The converted values at this time
are referred to as digital operation values.
For a main A/D converter module, digital operation values are stored into CH
Digital operation value (RWr2 to
RWr5) at every sampling periods. For an extension A/D converter module, digital operation values are stored into
CH
Digital operation value (RWr12 to RWr15) at every sampling periods.
The sampling period of the main A/D converter module and the extension A/D converter module depends on the
conversion speed setting and the number of conversion enabled channels. For details, refer to the following:
• Conversion Speed and Sampling Period (
(2) Averaging processing
This processing performs averaging processing on digital operation values for each channel, storing the average
values into CH
Digital operation value (RWr2 to RWr5, RWr12 to RWr15).
There are three types of averaging processing as follows:
• Time average
• Count average
• Moving average
(a) Time average
This processing performs A/D conversion for a set time and averages the total excluding the maximum and
minimum values, storing the average value into CH
Digital operation value (RWr2 to RWr5, RWr12 to
RWr15).
The number of processing times varies depending on the sampling period.
Ex.
The number of processing times assuming the following settings with no extension module connected
For the time average, the valid lower limit value to be set is given by: Minimum number of processing times, or
4
×
Sampling period.
Item
Setting
Number of channels used (number of channels where A/D conversion is enabled)
4 channels (CH1 to CH4)
Conversion speed
400
μ
s/channel
Setting time
15ms
Number of processing times (times) =
Setting time
Sampling period
= 9.375 (times)
Rounded down to the nearest whole number
Nine times of measurement is performed to output the average value.
15
(4 0.4)
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