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Analog Input Terminals Section 7-4
from the pull-down menu in the Last Maintenance Date field. (To enter the
current date, select Today, which is at the bottom of the pull-down menu.)
3. Return to the General Tab, click the Download Button, and then click the
Reset Button to reset the Unit.
4. Click the OK Button and exit the window.
7-4-4 Calculating the Conversion Cycle (DRT2-AD04 Only)
The conversion cycle speed can be improved by setting the number of AD
conversion points, but will vary with the use of the math operations. Use the
following table and formula to calculate the conversion cycle time.
Formula AD conversion cycle time = AD base conversion time + (Additional time for
each function)
AD base conversion time: Cycle time when the math operation is not used at
all. The value for each conversion point from 1 to 4 is different.
Extra time for each function: The additional time that is required when math
operations are used.
The following table shows the AD base conversion times (unit: ms).
Note The DeviceNet communications cycle is 4 ms.
The following table shows the additional time required for each function
(unit: ms).
Time 1 point 2 points 3 points 4 points
Max 1.66 2.42 3.21 3.82
Min 0.68 0.81 1.47 2.03
Average 0.88 1.60 2.32 3.07
Σ
Math operation Additional time for each point
Moving average 0.045
Scaling 0.055
Peak/bottom hold 0.025
Top/valley hold 0.070
Comparator 0.065
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