Mitsubishi Electric MELSEC iQ-R Series User Manual page 45

Current input characteristics
The following shows the list of the analog input ranges and the graph of each current input characteristic, at the current input.
digit
32767
32000
(2)
0
-768
-32000
-32768
-40 -20
digit: Digital output value
I: Analog input current (mA)
(a): Practical analog input range
No. Input range setting
(1) 4 to 20mA
(2) 0 to 20mA
(3) 4 to 20mA (extended mode)

User range setting
*1 Set the offset value and gain value in the user range setting within a range that satisfies the following conditions. If the following
conditions are not satisfied, A/D conversion may not be performed properly.
Gain value  20mA, offset value  0mA
((gain value) - (offset value))  6.1mA
*2 Maximum resolution in the user range setting.
*3 When analog input exceeds the range of the digital output value, the digital output value is fixed to the maximum or minimum.
Input range setting
4 to 20mA
0 to 20mA
4 to 20mA (extended mode)
User range setting
• Set values within the practical range of the analog input and digital output at each input range. If the values
are out of the range, the resolution and accuracy may not fall within the range of the performance
specifications. (Do not use values in the dotted line region in the graph of current input characteristics.)
• The range of 4 to 20mA (extended mode) allows extending the lower limit value of analog input. The upper
limit value of analog input cannot be extended.
• Do not set the voltage over 30mA. Doing so can cause breakdown of the elements.
(a)
(1)
4
I
0 20 40
Offset value Gain value
4mA 20mA
0mA 20mA
4mA 20mA
*1 *1
Digital output value
Minimum
-768
-8768
-32768
digit
32767
32000
0
-8000
-8768
-32000
-32768
-40 -20
Digital output value
0 to 32000
-8000 to 32000
-32000 to 32000
Maximum
32767
Appendix 1 I/O Conversion Characteristics
(a)
(3)
4
I
0 20 40
*3
Resolution
500.0nA
625.0nA
500.0nA
*2
190.7nA
APPX
A
43