Input Conversion Characteristics - Mitsubishi Electric MELSEC iQ-F FX5 User Manual

Input conversion characteristics

The input conversion characteristics of A/D conversion are expressed by the slope of the straight line connecting the offset
value and the gain value, both of which are used when an analog signal (voltage or current) from outside the programmable
controller is converted to the corresponding digital output value.
Offset value
This value is the analog input value (voltage or current) where the corresponding digital output value is 0.
Gain value
This value is the analog input value (voltage or current) where the corresponding digital output value is 32000.
Voltage input characteristics
The following shows the list of the analog input ranges and the graphs of each voltage input characteristic, at the voltage
input.
(a)
digit
32767
32000
(2)
(3)
0
1
-768
(4)
-32000
-32768
-15 -10 -5 0
digit: Digital output value
V: Analog input voltage (V)
(a): Practical analog input range
No. Input range setting
(1) 0 to 10 V
(2) 0 to 5 V
(3) 1 to 5 V
(4) -10 to +10 V
*1 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: -10 to +10 V
((Gain value) - (Offset value))  4 V
*2 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 10 V
0 to 5 V
1 to 5 V
-10 to +10 V
(1)
V
+5 +10 +15
Offset value
0 V
0 V
1 V
0 V
Digital output value
Minimum
-768
-32768
Gain value Digital output
*2
value
10 V 0 to 32000
5 V
5 V
10 V -32000 to +32000
Maximum
+32767
3
Resolution
312.5 V
156.25 V
125 V
312.5 V
3 FX5-8AD
331
3.2 Specifications