Relationship Between Offset/Gain Setting And Analog Output Value; Accuracy - Mitsubishi Electric AJ65VBTCU-68DAVN User Manual

3 SPECIFICATION

3.3.2 Relationship between offset/gain setting and analog output value

3.3.3 Accuracy

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How to calculate the analog output value:
The resolution of AJ65VBTCU-68DAVN can be set arbitrarily by modifying the setting
of the offset value and gain value.
How to calculate the analog value resolution and the analog output value for a given
digital input value when the settings of the offset value and gain value are changed is
shown next.
(1) Resolution
Find the resolution with the following expression.
(Analog resolution) =
(2) Analog output value
Find the analog output value with the following expression.
(Analog output) = (Analog resolution) × (Digital input value) + (Offset value)
Accuracy is relative to the maximum value of the analog output value.
If you change the offset/gain setting or output range to change the output
characteristic, accuracy does not change and is held within the range indicated in the
performance specifications.
(1) Accuracy of voltage output
For voltage output, the maximum value of the analog output value changes with
the range.
For example, accuracy is relative to 5V when the 0 to 5V range is selected.
Analog output is provided at the accuracy of within ±0.2% (±10mV) when the
operating ambient temperature is 25±5°C, or within ±0.3% (±15mA) when the
operating ambient temperature is 0 to 55°C.
5V
0V
Fig. 3.2 Voltage Output Accuracy (When 0 to 5V Range Is Selected)
(Gain value) - (Offset value)
4000
0
Digital input value
MELSEC-A
Varies within the range of
0.2% ( 10mV) at operating
ambient temperature of 25 5
Varies within the range of
0.3% ( 15mV) at operating
ambient temperature of 0 to 55
4000
.
.
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