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4 Programming
4.3 Switching of Input Mode
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX
3U
-3A-ADP (2-channel analog Input, 1-channel analog output)
•FX3G Series PLC
R: Read / W: Write
4.3 Switching of Input Mode
Turn the special auxiliary relay on/off to switch the input mode of 3A-ADP between the current input mode
and the voltage input mode.
To switch the input mode, use the following special auxiliary relays:
•FX
3U, FX3UC Series PLC
•FX
3G Series PLC
1. Program Example (For FX3U, FX3UC Series PLC)
To switch the channel input mode, create a sequence program as follows:
Special device
Device number
Description Attribute Reference
1st 2nd
Special auxiliary
relay
M8280 M8290 Switches the input mode of channel 1 R/W
Section 4.3
M8281 M8291 Switches the input mode of channel 2 R/W
M8282 M8292 Switches the output mode. R/W Section 4.4
M8283 M8293
Unused (Do not use.) - -M8284 M8294
M8285 M8295
M8286 M8296 Sets the cancel of output holding function. R/W Section 4.5
M8287 M8297 Sets whether or not the input channel 1 is used. R/W
Section 4.6M8288 M8298 Sets whether or not the input channel 2 is used. R/W
M8289 M8299 Sets whether or not the output channel is used. R/W
Special data
register
D8280 D8290 Channel-1 input data R
Section 4.7
D8281 D8291 Channel-2 input data R
D8282 D8292 Output setting data R/W Section 4.8
D8283 D8293 Unused (Do not use.) - -
D8284 D8294
Averaging time for channel-1 (Setting range: 1
to 4095)
R/W
Section 4.9
D8285 D8295
Averaging time for channel-2 (Setting range: 1
to 4095)
R/W
D8286 D8296
Unused (Do not use.) - -
D8287 D8297
D8288 D8298 Error status R/W Section 4.10
D8289 D8299 Model code = 50 R Section 4.11
Special auxiliary relay
Description
1st 2nd 3rd 4th
M8260 M8270 M8280 M8290 Switches the input mode of channel 1
OFF:Voltage input
ON :Current input
M8261 M8271 M8281 M8291 Switches the input mode of channel 2
Special auxiliary relay
Description
1st 2nd
M8280 M8290 Switches the input mode of channel 1
OFF:Voltage input
ON :Current input
M8281 M8291 Switches the input mode of channel 2
1) To switch the input mode of channel
1 of the 1st analog special adapter to
the voltage input mode:
M8001
M8260
Normally OFF
2) To switch the input mode of channel 2
of the 1st analog special adapter to the
current input mode:
M8000
M8261
Normally ON