Mitsubishi Electric FX3G User Manual page 140

FX /FX /FX /FX /FX
3S 3G 3GC 3U
FX -4AD/FX -4AD (4-channel Analog Input)
3U 3UC
2
Determine the input characteristics to be changed.
Determine the digital value to be output according to the input voltage/current.
Example: To output digital values in the range from 0 to 32000 by inputting the voltage in the range
from 1V DC to 5V DC:
Input mode 0 Input characteristics provided at the time
of factory shipment
Digital value
Gain reference value
Input voltage
-10V
3
Determine the offset data.
Determine the analog input value (offset data) for digital output value of "0".
Set the analog input value in mV for the voltage input mode, and set the analog input value in μA
for the current input mode.
Example: To set the offset value of 1 V, set 1,000 mV.
4
Determine the gain data.
Determine the analog input value so that the digital output value is equal to the gain reference
value of each input mode.
The following table shows the gain reference value of each input mode:
Numeric
value
0
1
3
4
6
7
Set the analog input value in mV for the voltage input mode, and set the analog input value in μA
for the current input mode.
Example: To set the gain value of 3 V, set 3000 mV.
B-50
PLC User's Manual - Analog Control Edition
3UC
+32640
+32000
(+16000)
0
+5V +10V
-32000
-32640
→ For a detailed description of offset data, refer to Subsection 5.4.14.
Input mode
Voltage input mode
Voltage input mode
Current input mode
Current input mode
Current input mode
Current input mode
→ For a detailed description of gain data, refer to Subsection 5.4.14.
Input characteristics newly provided
Gain reference value
Offset reference value (0)
Input voltage
Analog input range Gain standard value
-10V to +10V
-10V to +10V
4mA to 20mA
4mA to 20mA
-20mA to +20mA
-20mA to +20mA
6 Changing Input Characteristics
6.1 Procedure for Changing Input Characteristics
Digital value
+32000
(+16000)
+1V +3V
Initial value
16000 5000mV
2000 5000mV
16000 20000μA
4000 20000μA
16000 20000μA
4000 20000μA
+5V