93
CHAPTER 8 FUNCTIONS
8
8.5 Co
nver
sion Speed
S
w
itch F
unction
If the number of conversion enabled channels is different between a main A/D converter module and an extension A/D
converter module, the main A/D converter module and the extension A/D converter module perform A/D conversion at each
different sampling period.
For example, assuming the following settings:
• Conversion speed setting: 100
μ
s
• Conversion enabled channels of the main A/D converter module: CH1, CH2, CH3 (number of conversion enabled
channels: 3)
• Conversion enabled channels of the extension A/D converter module: CH1, CH2 (number of conversion enabled
channels: 2)
Sampling period of the main A/D converter module = (Conversion speed (100
μ
s) + Processing time (100
μ
s))
×
3 = 600
μ
s
Sampling period of the extension A/D converter module = (Conversion speed (100
μ
s) + Processing time (100
μ
s)
×
2 =
400
μ
s
(3) When an extension D/A converter module is connected to a main A/D
converter module
When an extension D/A converter module is connected to a main A/D converter module, the conversion speed is
fixed to 100
μ
s for the main A/D converter module and the extension D/A converter module. The setting of the
conversion speed switch (address: 0001H) is ignored. In addition, between the conversion processing of each
channel, processing time (100
μ
s) is generated.
Therefore, the sampling period of the main A/D converter module is given by the following:
Sampling period = (Conversion speed (100
μ
s) + Processing time (100
μ
s))
×
Number of conversion enabled
channels
Ex.
Assuming that the number of conversion enabled channels is 4 for both the main A/D converter module
and the extension D/A converter module
Sampling period of the main A/D converter module = (100
μ
s + 100
μ
s)
×
4 = 800
μ
s
Sampling period of the extension D/A converter module = (100
μ
s + 100
μ
s)
×
4 = 800
μ
s
100μs
CH1
100μs
100μs
CH2
100μs
100μs
CH3
100μs
100μs
CH1
100μs
CH1
CH2
CH1
CH2
Main A/D converter module
(conversion enabled
channels: CH1 to CH3)
Extension A/D converter
module (conversion enabled
channels: CH1 and CH2)
Sampling period of the main A/D converter module
Conversion
processing
Processing
time
Conversion
processing
Processing
time
Conversion
processing
Processing
time
Conversion
processing
Processing
time
Sampling period of the extension A/D converter module
Conversion
processing
Processing
time
Conversion
processing
Processing
time
Conversion
processing
Processing
time
Conversion
processing
Processing
time
100μs
CH1
100μs
100μs
CH2
100μs
100μs
CH3
100μs
100μs
CH4
100μs
CH1
CH2
CH3
CH4
Main A/D converter module
(conversion enabled
channels: CH1 to CH4)
Extension D/A converter
module (conversion enabled
channels: CH1 to CH4)
Sampling period of the main A/D converter module
Conversion
processing
Processing
time
Conversion
processing
Processing
time
Conversion
processing
Processing
time
Conversion
processing
Processing
time
Conversion period of the extension D/A converter module
Conversion
processing
Processing
time
Conversion
processing
Processing
time
Conversion
processing
Processing
time
Conversion
processing
Processing
time
Содержание NZ2EX2B-60AD4
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