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D-14
4 Programming
4.2 List of Special Devices
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX3G-2AD-BD (2-channel analog Input)
4.2 List of Special Devices
If the 2AD-BD is connected, special devices will be assigned automatically as shown in the following table:
R: Read / W: Write
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:
1. Program Example
To switch the channel input mode, create a sequence program as follows:
Special device
Device number
Description Attribute Reference
1st board 2nd board
Special auxiliary relay
M8260 M8270 Switches the input mode of channel 1 R/W
Section 4.3
M8261 M8271 Switches the input mode of channel 2 R/W
M8262 to
M8269
M8272 to
M8279
Unused (Do not use.) - -
Special data register
D8260 D8270 Channel-1 input data R
Section 4.4
D8261 D8271 Channel-2 input data R
D8262 D8272
Unused (Do not use.) - -
D8263 D8273
D8264 D8274
Averaging time for channel-1 (Setting
range: 1 to 4095)
R/W
Section 4.5
D8265 D8275
Averaging time for channel-2 (Setting
range: 1 to 4095)
R/W
D8266 D8276
Unused (Do not use.) - -
D8267 D8277
D8268 D8278 Error status R/W Section 4.6
D8269 D8279 Model code = 3 R Section 4.7
Special auxiliary relay
Description
1st board 2nd board
M8260 M8270 Switches the input mode of channel 1
OFF: Voltage input
ON: Current input
M8261 M8271 Switches the input mode of channel 2
1) To switch the input mode of channel
1 of the 1st analog board to the voltage
input mode:
M8001
M8260
Normally OFF
2) To switch the input mode of channel 2
of the 1st analog board to the current
input mode:
M8000
M8261
Normally ON