Mitsubishi MELSEC-L Series User Manual page 118

(4) Current input characteristic
The following graph shows the current input characteristic.
No. Input range setting
1)
2)
3)
*1 Set the offset value and gain value in the user range setting within the range satisfying the following conditions.
If the following conditions are not satisfied, A/D conversion may not be properly performed.
• gain value 20 mA, offset value ≥ 0 mA
• ((gain value) - (offset value)) ≥ 16.0 mA
*2 When analog input is performed exceeding the range of digital output value, the digital output value is fixed to the
maximum or minimum.
Input range setting
User range setting
*3 This is the maximum resolution in user range setting.
● Use the value within the practical analog input range and practical digital output range. If a value is out of the range, the
resolution and accuracy may not fall within the range of performance specifications. (Do not use the value in the dotted
line region in the graph above.)
● Do not input a value of ±30mA or more. This may damage the elements.
116
20479
20000
0
-480
-20000
-20480
-30
Offset value
4 to 20mA 4mA
0 to 20mA 0mA
User range setting
4 to 20mA
0 to 20mA
Practical analog input range
2)
4
-20 0 20
Analog input current (mA)
Gain value
Digital output value *
20mA
20mA
*1 *1
Digital output value
Minimum
-480
-20480
1)
30
2
0 to 20000
-20000 to 20000
Maximum
20479
Resolution
800nA
1000nA
3
1230nA *