Mitsubishi Electric MELSEC iQ-F FX5 User Manual page 23

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.
(a)
digit
+32767
+32000
(1)
(2)
0
4
-768
(3)
-32000
-32768
-30 -20 0 +20
digit: Digital output value
I: Analog input current (mA)
(a): Practical analog input range
No. Input range setting
(1) 0 to 20 mA
(2) 4 to 20 mA
(3) -20 to +20 mA
 User range setting
*1 If an analog input value exceeds the range of digital output value, the digital output value is fixed to the maximum or minimum value.
Input range setting
0 to 20 mA
4 to 20 mA
-20 to +20 mA
User range setting
*2 Set the offset value and gain value in the user range setting within a range satisfying the following conditions. Failure to satisfy the
conditions may not result in proper A/D conversion.
Setting range of the offset value and gain value: 0 to 20 mA
((Gain value) - (Offset value))  6.0 mA
*3 Maximum resolution in the user range setting. The resolution reaches the maximum when (gain value - offset value) = 16 mA. Even
when (gain value - offset value) < 16 mA, the maximum resolution is unchanged.
• Set values within the practical range of the analog input and the digital output at each input range. If the
range is exceeded, the resolution and accuracy may not fall within the range of the performance
specifications. (Do not use the values in the dotted line region in the graph of current input characteristics.)
• Do not set the current over 30 mA. Doing so can cause breakdown of components.
• If a current is input from an external device into a channel set for voltage as the input type, an overvoltage
may occur and destroy components. Limit the voltage so that the external device's voltage value does not
exceed the range of -10 to +10 V.
• When applying the current on the negative side by using the input range of the current, start up the module,
and after 'A/D conversion completed flag' turns on, start input from the external device.
• When using the input range of the current, do not perform the following operations.
- Change the "A/D conversion enable/disable setting" while the current on the negative side from the external
device is applied.
- Change the "Range setting" while the current on the negative side from the external device is applied.
I
+30
Offset value Gain value
0 mA 20 mA
4 mA 20 mA
0 mA 20 mA
*2 *2
Digital output value
Minimum
-768
-32768
*1
Digital output value
0 to 32000
-32000 to +32000
Maximum
+32767
1.2 Specifications
1
Resolution
625 nA
500 nA
625 nA
*3
500 nA
1 FX5-4AD
21