Appendix A: Special Device List
354
FX3G Series Programmable Controllers
User's Manual - Hardware Edition
Appendix A-1 Special Auxiliary Relay (M8000 to M8511)
*1. Cleared when PLC switches from RUN to STOP.
*2. Cleared when PLC switches from RUN to STOP or when
RS2 instruction [ch0] is OFF.
*3. 1ms ring counter (D8399, D8398) will operate after M8398
turns ON.
*4. Cleared when PLC switches from RUN to STOP or when
RS2 instruction [ch1] is OFF.
Number and
name
Operation and function
Correspond-
ing special
device
Positioning
[M]8330 to [M]8337 Not used -
M 8338
*1
PLSV (FNC157) instruction:
Acceleration/deceleration operation
-
[M]8339 Not used -
[M]8340
[Y000] Pulse output monitor
(ON: BUSY/ OFF: READY)
-
M 8341
*1
[Y000] Clear signal output function
enable
-
M 8342
*1
[Y000] Zero return direction
specification
-
M 8343 [Y000] Forward limit -
M 8344 [Y000] Reverse limit -
M 8345
*1
[Y000] DOG signal logic reverse -
M 8346
*1
[Y000] Zero point signal logic
reverse
-
M 8347 Not used -
[M]8348
[Y000] Positioning instruction
activation
-
M 8349
*1
[Y000] Pulse output stop command -
[M]8350
[Y001] Pulse output monitor
(ON: BUSY/ OFF: READY)
-
M 8351
*1
[Y001] Clear signal output function
enable
-
M 8352
*1
[Y001] Zero return direction
specification
-
M 8353 [Y001] Forward limit -
M 8354 [Y001] Reverse limit -
M 8355
*1
[Y001] DOG signal logic reverse -
M 8356
*1
[Y001] Zero point signal logic
reverse
-
M 8357 Not used -
[M]8358
[Y001] Positioning instruction
activation
-
M 8359
*1
[Y001] Pulse output stop command -
[M]8360
[Y002] Pulse output monitor
(ON: BUSY/ OFF: READY)
-
M 8361
*1
[Y002] Clear signal output function
enable
-
M 8362
*1
[Y002] Zero return direction
specification
-
M 8363 [Y002] Forward limit -
M 8364 [Y002] Reverse limit -
M 8365
*1
[Y002] DOG signal logic reverse -
M 8366
*1
[Y002] Zero point signal logic
reverse
-
M 8367 Not used -
[M]8368
[Y002] Positioning instruction
activation
-
M 8369
*1
[Y002] Pulse output stop command -
Number and
name
Operation and function
Correspond-
ing special
device
RS2 (FNC 87) [ch0]
[M]8370 Not used -
M 8371
*2
RS2 (FNC 87) [ch0] Send wait flag -
M 8372
*2
RS2 (FNC 87) [ch0] Send request D8372
M 8373
*2
RS2 (FNC 87) [ch0]
Receive complete flag
D8373
[M]8374 to [M]8378 Not used -
M 8379
RS2 (FNC 87) [ch0]
Time-out check flag
-
High Speed Counter Function
[M]8380 to [M]8387 Not used -
[M]8388
Contact for high speed counter
function change
-
M 8389 to M 8391 Not used -
M 8392
Function changeover device for
C248 and C253
-
[M]8393 Not used -
[M]8394 Not used -
[M]8395
Function changeover device for
C254
-
[M]8396
Not used
-
[M]8397 -
Ring Counter
M 8398
Ring counter operation
(in units of 1ms, 32 bits)
*3
D8398
D8399
[M]8399 Not used -
RS2 (FNC 87) [ch1]
[M]8400 Not used -
[M]8401
*4
RS2 (FNC 87) [ch1] Send wait flag -
M 8402
*4
RS2 (FNC 87) [ch1] Send request D8402
M 8403
*4
RS2 (FNC 87) [ch1]
Receive complete flag
D8403
[M]8404
RS2 (FNC 87) [ch1]
Carrier detection flag
-
[M]8405
RS2 (FNC 87) [ch1]
Data set ready (DSR) flag
-
[M]8406
Not used
-
[M]8407 -
[M]8408 -
M 8409
RS2 (FNC 87) [ch1]
Time-out check flag
-
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