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FX3U Series Programmable Controllers
User’s Manual - Hardware Edition
A Operation of Special Devices (M8000 -, D8000 -)
A-1 Special Auxiliary Relay (M8000 to M8511)
High Speed Counter Up/down Counter Monitoring
[M]8246 C246
When C of 1-phase
2-input or 2-phase
2-input counter is in down
mode, the
corresponding M8
turns ON.
• ON: Down count operation
• OFF: Up count operation
–
[M]8247 C247 –
[M]8248 C248 –
[M]8249 C249 –
[M]8250 C250 –
[M]8251 C251 –
[M]8252 C252 –
[M]8253 C253 –
[M]8254 C254 –
[M]8255 C255 –
[M]8256 to [M]8259
Not used –
Analog Special Adapter
M 8260 to M 8269
*1
1st special adapter –
M 8270 to M 8279
*1
2nd special adapter –
M 8280 to M 8289
*1
3rd special adapter –
M 8290 to M 8299
*1
4th special adapter –
*1. The number of connected FX3U-4AD-ADP, FX3U-4DA-
ADP, FX
3U-4AD-TC-ADP and FX3U-4AD-PT-ADP units is
counted from the main unit side.
Flag
[M]8300 to [M]8303
Not used –
[M]8304
*2
Zero
Turns ON when the multiplication
or division result is 0.
–
[M]8305 Not used –
[M]8306
*2
Carry
Turns ON when the division result
overflows.
–
[M]8307 to [M]8315
Not used –
*2. Supported in Ver. 2.30 or later
Unconnected I/O Designation Error and flag
[M]8316
*3
Unconnected I/O designation error
D8316
D8317
[M]8317 Not used –
[M]8318
BFM initialization failure
ON when a FROM/TO error has
occurred in a special function
block/unit as specified in the BFM
initialization function at changing
PLC from STOP to RUN.
When M8318 turns ON, the unit
number in which the error has
occurred is stored in D8318, and
the BFM number is stored in
D8319.
D8318
D8319
[M]8319 to [M]8327
Not used –
[M]8328 Instruction non-execution –
[M]8329 Instruction execution abnormal end –
*3. If the I/O device numbers are unavailable, M8316 turns
ON when its directly designated to device numbers
including LD, AND, OR, and OUT instructions or indirectly
designated by index.
Number and
name
Operation and function
Correspond-
ing special
device
Timing Clock and Positioning
[M]8330
DUTY (FNC186) instruction:
Timing clock output 1
D8330
[M]8331
DUTY (FNC186) instruction:
Timing clock output 2
D8331
[M]8332
DUTY (FNC186) instruction:
Timing clock output 3
D8332
[M]8333
DUTY (FNC186) instruction:
Timing clock output 4
D8333
[M]8334
DUTY (FNC186) instruction:
Timing clock output 5
D8334
[M]8335 Not used –
M 8336
*4
DVIT (FNC151) instruction:
Interrupt input specification
function enabled
D8336
[M]8337 Not used –
M 8338
PLSV (FNC157) instruction:
Acceleration/deceleration
operation
–
[M]8339 Not used –
[M]8340
[Y000] Pulse output monitor
(ON:
BUSY/ OFF: READY)
–
M 8341
*4
[Y000] Clear signal output function
enable
–
M 8342
*4
[Y000] Zero return direction
specification
–
M 8343 [Y000] Forward limit –
M 8344 [Y000] Reverse limit –
M 8345
*4
[Y000] DOG signal logic reverse –
M 8346
*4
[Y000] Zero point signal logic
reverse
–
M 8347
*4
[Y000] Interrupt signal logic
reverse
–
[M]8348
[Y000] Positioning instruction
activation
–
M 8349
*4
[Y000] Pulse output stop command –
*4. Cleared when PLC switches from RUN to STOP.
Number and
name
Operation and function
Correspond-
ing special
device
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