Mitsubishi Electric NZ2EX2B-60AD4 - Page 93

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CHAPTER 8 FUNCTIONS
8
8.5 Conversion Speed Switch Function
(1) When an extension module is not connected or an extension I/O module is
connected
The sampling period is given by the following:
Sampling period = Conversion speed × Number of conversion enabled channels
Ex.
Assuming that the conversion speed setting is 100μs and the number of conversion enabled channels is
4
Sampling period of the main A/D converter module = 100μs × 4 = 400μs
(2) When an extension A/D converter module is connected to a main A/D
converter module
When an extension A/D converter module is connected to a main A/D converter module, processing time (100μs)
is generated between the conversion processing of each channel.
(a) With a conversion speed of 100μs
Between the conversion processing (100μs) of each channel, processing time (100μs) is generated. Therefore,
the sampling period is given by the following:
Sampling period = (Conversion speed (100μs) + Processing time (100μs)) × Number of conversion enabled
channels
Ex.
Assuming that the conversion speed setting is 100μs and the number of conversion enabled channels is
4 for both the main A/D converter module and the extension A/D converter module
Sampling period of the main A/D converter module = (100μs + 100μs) × 4 = 800μs
Sampling period of the extension A/D converter module = (100μs + 100μs) × 4 = 800μs
100μs
CH1
100μs
CH2
100μs
CH3
100μs
CH4
100μs
CH1
100μs
CH2
100μs
CH3
100μs
CH4
Main A/D converter module
(conversion enabled
channels: CH1 to CH4)
Sampling period of the main A/D converter module
Conversion
processing
Conversion
processing
Conversion
processing
Conversion
processing
Conversion
processing
Conversion
processing
Conversion
processing
Conversion
processing
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 A/D 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
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