3. AIAO Units
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1-103
3.2.2.9 D/A Conversion Curve
Adjust the conversion curves according to the application requirements by modifying the Offset
values (CR#28 ~ CR#31) and Gain values (CR#34 ~ CR#37) for CH1 ~ CH4.
Gain: The corresponding voltage (current) output value when the digital input value = 16,000.
Offset: The corresponding voltage (current) output value when the digital input value = 0.
z
For voltage output Mode 0: 0.3125mV = 20V/64,000
Equation:
( )
(
)
⎟
⎠
⎞
⎜
⎝
⎛
×
⎥⎦
⎤
⎢⎣
⎡
+
−
×
=
32000
)
(
10
16000
V
Offset
Offset
Gain
X
V
Y
Y= Voltage output, X= Digital input
z
For current output Mode 1: 0.625
μ
A = 20mA/32,000
Equation:
( )
(
)
⎟
⎠
⎞
⎜
⎝
⎛
×
⎥⎦
⎤
⎢⎣
⎡
+
−
×
=
32000
)
(
20
16000
mA
Offset
Offset
Gain
X
mA
Y
Y= Current output, X= Digital input
z
For current output Mode 2: 0.5
μ
A = 16mA/32,000
Use the current output mode 1 equation, then use 19,200(12mA) for the Gain and
6,400(4mA) for the Offset.
Equation:
( )
(
)
⎟
⎠
⎞
⎜
⎝
⎛
×
⎥⎦
⎤
⎢⎣
⎡
+
−
×
=
32000
)
(
20
6400
16000
6400
19200
mA
X
mA
Y
Y= Current output, X= Digital input
Voltage Output Mode
z
Mode 0 (H’0000): (-10V ~ +10V)
10V
+3 2,000
0
Offset
5V
Gai n
+1 6,000
Voltage
output
D igital input
-10 V
-5V
-32 ,0 00
+3 2,767
-32 ,7 68
Mode 0 of CR#2~ CR#5
-10V ~ +10V, Gain = 5V (16,000), Offset = 0V (0).
Gain (CR#28 ~ CR#31)
The corresponding voltage output value when the
digital input value = 16,000.
