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8.5
Conversion Speed and Conversion Period
Conversion speed is the rate at which the D/A converter module converts and outputs digital values.
The conversion period is the period for D/A conversion in a channel.
The following figure shows the relationship between conversion speed and a conversion period.
The conversion period varies depending on the type of main analog module, the conversion speed, the type of
extension module, and the number of conversion enabled channels.
The following table shows the classification.
*1
For an A/D converter module, this column corresponds to the sampling period.
*2
For details, refer to the following:
•
CC-Link IE Field Network Analog-Digital Converter Module User's Manual
(1) When an extension module is not connected or an extension I/O module is
connected
The conversion speed is 100
s/channel. The conversion period is given by the following:
Conversion period = Conversion speed (100
s)
Number of conversion enabled channels
Ex.
Assuming that the number of conversion enabled channels is 4
Conversion period = 100
s
4 = 400
s
Main analog module
Extension module
Conversion
speed setting
Conversion period
Reference
Main D/A converter
module
• Not connected
• Extension I/O
module
100
s
Number of conversion
enabled channels
Extension D/A
converter module
200
s
Number of conversion
enabled channels
Extension A/D
converter module
200
s
Number of conversion
enabled channels
Main A/D converter
module
• Not connected
• Extension I/O
module
• 100
s
• 400
s
• 1ms
Conversion speed
Number of
conversion enabled channels
Extension A/D
converter module
100
s
200
s
Number of conversion
enabled channels
400
s
500
s
Number of conversion
enabled channels
1ms
1ms
Number of conversion
enabled channels
Extension D/A
converter module
• 100
s
• 400
s
• 1ms
200
s
Number of conversion
enabled channels
CH1
CH1
Conversion period
: Period for conversion processing of one channel
Conversion
processing
Conversion
speed
Processing including
conversion processing
of other channels
Conversion
processing
100μs
CH1
100μs
CH2
100μs
CH3
100μs
CH4
100μs
CH1
100μs
CH2
100μs
CH3
100μs
CH4
Main D/A converter module
(conversion enabled
channels: CH1 to CH4)
Conversion period of the main D/A converter module
Conversion
processing
Conversion
processing
Conversion
processing
Conversion
processing
Conversion
processing
Conversion
processing
Conversion
processing
Conversion
processing