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3. SPECIFICATIONS MELSEC-A
3-4
3.3 I/O Conversion Characteristics
The I/O conversion characteristics of the AJ65BT-64DAV/DAI are explained.
3.3.1 Offset value and gain value
(1) Offset value
This is an analog value (voltage or current value) produced by the AJ65BT-64DAV/DAI when the
digital value set by the programmable controller CPU is "0".
(2) Gain value
This is an analog value (voltage or current value) produced by the AJ65BT-64DAV/DAI when the
digital value set by the programmable controller CPU is "2000" for AJ65BT-64DAV, and "4000"
for AJ65BT-64DAI.
(3) The factory-set offset and gain values are as follows:
AJ65BT-64DAV AJ65BT-64DAI
Offset value 0V 4mA
Gain value 10V 20mA
(4) The offset value and gain value can be set separately for each channel in the test mode.
3.3.2 I/O conversion characteristics
(1) When AJ65BT-64DAV is used:
15
(V)
10
5
-5
-10
-15
0
-2000
-2048
2000
2047
0
A
n
a
l
o
g
o
u
t
p
u
t
v
o
l
t
a
g
e
Offset value Gain value
Digital input value
A
nalog output
practical range
Figure 3.1 I/O conversion characteristics of the AJ65BT-64DAV
1
How to calculate the analog output value:
The resolution of AJ65BT-64DAV can be set arbitrarily by modifying the settings 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.