Mitsubishi Electric MELSEC-FX3S Series - List of Special Devices

C-18
4 Programming
FX 3S /FX 3G /FX 3GC /FX 3U /FX 3UC PLC User's Manual - Analog Control Edition
FX3U-4AD-ADP (4-channel Analog Input)
4.2 List of Special Devices
•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.
*3. An expansion board is required to connect the FX
3U-4AD-ADP to the FX3U/FX3UC-32MT-LT(-2) PLC.
4.2 List of Special Devices
If the 4AD-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 input mode of channel 3 R/W
M8283 Switches the input mode of channel 4 R/W
M8284 to M8289 Unused (Do not use.) - -
Special
data
register
D8280 Channel-1 input data R
Section 4.4
D8281 Channel-2 input data R
D8282 Channel-3 input data R
D8283 Channel-4 input data R
D8284
Averaging time for channel-1
(Setting range: 1 to 4095)
R/W
Section 4.5
D8285
Averaging time for channel-2
(Setting range: 1 to 4095)
R/W
D8286
Averaging time for channel-3
(Setting range: 1 to 4095)
R/W
D8287
Averaging time for channel-4
(Setting range: 1 to 4095)
R/W
D8288 Error status R/W Section 4.6
D8289 Model code = 1 R Section 4.7
Sequence
program
Special devices
A/D
A/D
A/D
A/D
Communi-
cation
special
adapter
FX 3U -4AD
-ADP
FX 3U -4AD
-ADP
FX 3U -4AD
-ADP
FX 3U -4AD
-ADP
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
FX 3U /FX 3UC Series PLC
*1