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3 SPECIFICATION
3.3.2 Current input characteristics
Number
1)
2)
—
The current input characteristic graph is shown below.
4095
4000
2000
0
-96
-2000
-4000
-30
Analog Input Range Setting
0 to 20mA
4 to 20mA
User range setting 3 (0 to 20mA)
Fig. 3.2 Current Input Characteristic
POINT
(1) Do not input more than ±30mA. A breakdown may result due to heat increase.
(2) If the analog input provided corresponds to the digital output value* beyond its
range, the digital output value is fixed to the maximum or minimum.
For 0 to 4000, the digital output value is within the range -96 to 4095.
(3) Within the analog input and digital output scopes of each input range, the
maximum resolution and accuracy are within the performance specification
range. Outside those scopes, however, they may not fall within the performance
specification range. (Avoid using the dotted line part in Fig. 3.2.)
(4) Set the offset and gain values of the user range setting within the range
satisfying the following conditions.
(a) Setting range when user range setting 3 is selected: 0 to 20mA
(b) (Gain value) > (Offset value)
If you attempt to make setting outside the setting range of (a), the "RUN" LED
flickers at 0.5s intervals.
Set the values within the setting range.
If you attempt to make setting outside the setting range of (b), the "RUN" LED
flickers at 0.5s intervals.
Make setting again.
Analog input
parcitcal value
1
4
-20
-10
0
Analog input current (mA)
Offset
Value
0mA
4mA
0mA
3 - 5
MELSEC-A
2
10
20
30
Gain
Digital Output
Value
Value*
20mA
0 to 4000
20mA
20mA
Maximum
Resolution
5µA
4µA
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