H-19
4 Programming
4.2 List of Special Devices
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX
3U
-3A-ADP (2-channel Analog Input, 1-channel Analog Output)
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
•FX3U/FX3UC Series PLC
The analog special adapter nearest to the main unit is counted as the 1st analog special adapter, and the
next adapter as the 2nd analog special adapter, and so on. However, in this case, do not include the high-
speed input/output special adapter, communication special adapter, and the CF card special adapter.
*1. An expansion board is required to connect the FX
3U-3A-ADP to the FX3U/FX3UC-32MT-LT(-2) PLC.
4.2 List of Special Devices
If the 3A-ADP is connected, special devices will be assigned automatically as shown in the following table:
•FX
3S Series PLC
R: Read / W: Write
Special
device
Device number Description Attribute Reference
Special
auxiliary
relay
M8280 Switches the input mode of channel 1 R/W
Section 4.3
M8281 Switches the input mode of channel 2 R/W
M8282 Switches the output mode. R/W Section 4.4
M8283 to M8285 Unused (Do not use.) - -
M8286 Sets the cancel of output holding function. R/W Section 4.5
M8287
Sets whether or not the input channel 1 is
used.
R/W
Section 4.6M8288
Sets whether or not the input channel 2 is
used.
R/W
M8289
Sets whether or not the output channel is
used.
R/W
Special
data
register
D8280 Channel-1 input data R
Section 4.7
D8281 Channel-2 input data R
D8282 Output setting data R/W Section 4.8
D8283 Unused (Do not use.) - -
D8284
Averaging time for channel-1
(Setting range: 1 to 4095)
R/W
Section 4.9
D8285
Averaging time for channel-2
(Setting range: 1 to 4095)
R/W
D8286 to D8287 Unused (Do not use.) - -
D8288 Error status R/W Section 4.10
D8289 Model code = 50 R Section 4.11
Sequence
program
Special devices
A/D
or
D/A
Communic
-ation
special
adapter
FX
3U
-3A
-ADP
FX
3U
-3A
-ADP
FX
3U
-3A
-ADP
FX
3U
-3A
-ADP
FX
3U
/FX
3UC
Series PLC
*1
1st2nd3rd4th
Special auxiliary relays:
M8280 to M8289
Special data registers:
D8280 to D8289.
Special auxiliary relays:
M8270 to M8279
Special data registers:
D8270 to D8279
Special auxiliary relays:
M8260 to M8269
Special data registers:
D8260 to D8269
Special auxiliary relays:
M8290 to M8299
Special data registers:
D8290 to D8299
A/D
or
D/A
A/D
or
D/A
A/D
or
D/A
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