LG Industrial Systems G3F-DA4I, Руководство пользователя

Страница: 18 / 76

Chapter 2. SPECIFICATIONS
2 - 8
2.5.3 Relations between Offset/ Gain Value and Analog Output
The resolution of D/A conversion module can be changed by changing offset/ gain value. At the change of
offset/ gain value, the below formula can calculate resolution of analog value and analog output value by
digital input value.
Gain value - Offset value
Resolution =
8000
Gain value - Offset value
Analog output =
5
Digital input value
＋
Offset value
8000
Analog output = Resolution
5
Digital input value
5
Offset value
Ex) Gain value : 0 VDC Offset value : - 10 VDC Digital input value : 12000
0 – ( - 10 )
Resolution = = 0.00125
8000
Analog output = 0.00125
5
12000
＋
(- 10) = 5(V)
Since maximum resolution of D/A conversion module is like values on table2.5, if digital input value increase
or decrease one at a time, analog output value may be different with a result of above formula
Product code Analog output range Maximum resolution
G3F-DA4I DC 4
～
20 mA 1
μ
A
-10
～
10 VDC 1.25 mV
G3F-DA4V
-5
～
5 VDC 0.625 mV
DC 4
～
20 mA 1
μ
A
G4F-DA1A
-10
～
10 VDC 1.25 mV
[Table 2.5] Maximum resolution