35 CPU MODULE BUILT-IN ANALOG FUNCTION
35.3 Functions (Analog Input)
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■Calculation method of the scaling value
The value used is calculated from the following expression. (The value below the decimal point is rounded.)
• The max. resolution will not increase even if the scaling upper limit value and the scaling lower limit value
are set such that each digit is smaller than the max. resolution.
• If the scaling upper limit value is set lower than the scaling lower limit value, the digital operation value
decreases as the input voltage increases.
If both the scaling function and the digital clipping function are used simultaneously, the scaling calculation will be performed
for the resulting digital operation value after digital clipping.
Shift function
Function to add the set conversion value shift amount to the A/D conversion value and store the digital operation value.
Changes to the conversion value shifting amount will be reflected in the digital operation value in real time, allowing fine
adjustments to be easily performed during system startup.
Corresponding devices
The devices which are used by the shift function are listed below.
Setting methods
Sets the conversion value shift amount for the channel for which you want to use the conversion value shift.
This function does not need to be set in advance. The user can perform conversion value shifts at any time.
Operation
Adds a shifting amount to the A/D conversion value. The A/D conversion value with the added shift is stored as the digital
operation value.
When the digital operation value resulting from the shift processing exceeds the range between -32768 and +32767, the value
is fixed to the lower limit (-32768) or the upper limit (32767).
When using the sampling processing, the shift amount is added for every conversion cycle. When using the averaging
processing, the shift amount is added for every averaging process cycle. The results are stored as the digital operation value.
When using the scaling function at the same time, shift processing is performed on the resulting value after scaling
processing.
When the shift function, digital clipping function, and scaling function are used together, the added shift is applied to the value
after digital clipping and scaling, which results in a digital operation value range between -32768 to +32767.
Name CH1 CH2
Conversion value shift amount SD6030 SD6070
Name Allowable setting range Default value
Conversion value shift amount -32768 to +32767 0
Value after scaling =
Digital output value × (scaling upper limit value - scaling lower limit value)
4000
+ Scaling lower limit value
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