Mitsubishi Electric MELSEC-FX3S Series - Switching of Input Mode; Input Data

D-17
4 Programming
4.3 Switching of Input Mode
FX 3S /FX 3G /FX 3GC /FX 3U /FX 3UC PLC User's Manual - Analog Control Edition
FX3G-2AD-BD (2-channel Analog Input)
A
Common Items
B
FX
3U
-4AD
FX
3UC
-4AD
C
FX
3U
-4AD-ADP
D
FX
3G
-2AD-BD
E
FX
3U
-4DA
F
FX
3U
-4DA-ADP
G
FX
3G
-1DA-BD
H
FX
3U
-3A-ADP
I
FX
3U
-4AD-PT
-ADP
J
FX
3U
-4AD-PTW
-ADP
4.3 Switching of Input Mode
Turn the special auxiliary relay on/off to switch the input mode of 2AD-BD between the current input mode
and the voltage input mode. To switch the input mode, use the following special auxiliary relays:
•FX
3S Series PLC
•FX
3G Series PLC
1. Program Example (For FX3G Series PLC)
To switch the channel input mode, create a sequence program as follows:
4.4 Input Data
Numeric data type: Decimal (K)
The data converted by the 2AD-BD will be stored in the special data registers.
The special data registers that store the input data are shown in the following table:
•FX
3S Series PLC
•FX
3G Series PLC
The converted A/D immediate data or averaged data (data average conforming to the specified averaging
time) will be stored in the above data registers as the input data.
→ For a detailed description of the averaging time, refer to Section 4.5.
1. Caution regarding input data
Input data is for reading only.
Do not change (rewrite) the input data using sequence program, indicator, or device monitor of the
programming tool.
2. Program Example (For FX3G Series PLC)
Even if the input data is not stored in D100 or D101, data registers D8260 or D8261 can be directly used in
the timer/counter set value or in a PID instruction.
Special auxiliary relay Description
M8260 Switches the input mode of channel 1
OFF: Voltage input
ON: Current input
M8261 Switches the input mode of channel 2
Special auxiliary relay
Description
Board A Board B
M8260 M8270 Switches the input mode of channel 1
OFF: Voltage input
ON: Current input
M8261 M8271 Switches the input mode of channel 2
Special data register Description
D8260 Stores the channel-1 input data
D8261 Stores the channel-2 input data
Special data register
Description
Board A Board B
D8260 D8270 Stores the channel-1 input data
D8261 D8271 Stores the channel-2 input data
1) To switch the input mode of channel 1
of the board A to the voltage input mode:
M8001
M8260
Normally OFF
2) To switch the input mode of channel 2
of the board A to the current input mode:
M8000
M8261
Normally ON
M8000
Normally
ON
FNC 12
MOV
D8260 D100
FNC 12
MOV
D8261 D101
Stores the channel-1 input data
of the board A in the D100.
Stores the channel-2 input data
of the board A in the D101.