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3. SPECIFICATIONS
3.3
I/O Conversion Characteristics
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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:
Offset value
Gain value
(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:
(V)
15
10
5
0
-5
-10
-15
-2000
-2048
Figure 3.1 I/O conversion characteristics of the AJ65BT-64DAV
How to calculate the analog output value:
1
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.
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AJ65BT-64DAV
AJ65BT-64DAI
0V
4mA
10V
20mA
0
Digital input value
3-4
MELSEC-A
Offset value
Gain value
Analog output
practical range
2000
2047
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