C-20
5 Changing of Input Characteristics
5.1 Example: Changing of Voltage Input Characteristics
FX
3U
/FX
3UC
Series PLC User's Manual - Analog Control Edition
FX3U-4AD-ADP (4-channel analog Input)
5. Changing of Input Characteristics
Use scaling instruction (SCL/FNC 259) of the FX3U/FX3UC Series PLC to change the input characteristics.
→ For a detailed description of scaling instruction, refer to the FX
3U/FX3UC Series Programming
Manual - Basic & Applied Instruction Edition.
5.1 Example: Changing of Voltage Input Characteristics
This section describes an example of a program that can change the digital output range of 400 to 2000
(when the voltage input is 1 to 5V) to the digital output range of 0 to 10000.
1. Input characteristics
2. Example of program
For example, create the following program to change the digital input data of the 1st analog special adapter:
0
4000
10V
Analog input
400
2000
5V1V
0
10000
Digital value actually obtained
by A/D conversion
2000(5V)
400(1V)
Digital output to
be calculated
Voltage input characteristics
(product specifications)
Digital output value to be changed
X-axis
Y-axis
Digital output
M8001
M8260
Sets the input mode of channel 1 to the voltage input mode
(0 V to 10 V)
M8002
RST D8268.6
RST D8268.7
Error status: b6 = OFF
Error status: b7 = OFF
M8000
FNC 12
MOV
K1 D8264
Sets the number of averaging time to "1" for the channel-1 data
M8002
FNC 12
MOV
K2 D50
FNC 12
MOV
K400 D51
FNC 12
MOV
K0 D52
FNC 12
MOV
K2000 D53
FNC 12
MOV
K10000 D54
M8000
Program for setting scaling instruction table data
The result of operation by scaling instruction will be stored in
the D100.
Item
Number of points
Start
point
X-
coordinate
Y-
coordinate
End
point
X-
coordinate
Y-
coordinate
Description
Sets the number of points
A/D converted digital value
start point data
Digital output value of changed
X-axis value start point
2
Value Device
D50
400 D51
0D52
A/D converted digital value end
point data
Digital output value of changed
X-axis value end point
2000
D53
10000
D54
FNC 259
SCL
D8260 D50 D100
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