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7.6.2 D/A conversion characteristics
(1) D/A conversion characteristics on voltage outputs
(For analog output range from -10 to 10V in a standard resolution mode)
Analog output voltage
5.0025V
Digital input
0
0
Digital input value
10V
4000
-10V
- 4000
5.0000V
2000
2001
20022003 2004
2.5mV
Analog output voltage
Figure 7.14 D/A conversion characteristics (current output)
D/A converter modules convert digital quantities that are input from a QCPU
into analog values, and then output them. For example, the modules convert a
digital quantity of -4000 to a analog quantity of -10V and 4000 to 10V before
output. This means that the modules convert the digital input value of 1 to an
analog quantity of 2.5mV, and abandon digital input values in decimal places.
(2) D/A conversion characteristics on current outputs
(For analog output range from 0 to 20mA in a standard resolution mode)
A
n
a
lo
g
o
u
t
p
u
t
c
u
r
r
e
n
t
10.005mA
Input
0
0
A
n
a
lo
g
o
u
t
p
u
t
c
u
r
r
e
n
t
Digital input value
20mA
4000
-20mA
-4000
10.000mA
2000200120022003
5 A
Figure 7.15 D/A conversion characteristics (current output)
For current outputs, the modules convert a digital value 0 to 0mA and 4000 to
20mA. This means that the modules convert the digital input value of 1 to an
analog quantity of 5μA, and abandon digital input values in decimal places.
REMARK
A voltage or current value that is equivalent to a digital value of 1 through D/A
conversion (maximum resolution) differs depending on the setting of the
resolution mode (1/4000, 1/12000, 1/16000) or the output range.