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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
37 Operation of Special Devices (M8000 -, D8000 -)
37.1 Special Device List (M8000 -, D8000 -)
Positioning [FX3U PLCs] (Refer to Positioning Control Manual for details.)
[M]8370 [Y003] Pulse output monitor
(ON: BUSY/ OFF: READY)
–
3
*2
– – –––– –
M 8371
*1
[Y003] Clear signal output function enable –
3
*2
– – –––– –
M 8372
*1
[Y003] Zero return direction specification –
3
*2
– – –––– –
M 8373 [Y003] Forward limit
–
3
*2
– – –––– –
M 8374 [Y003] Reverse limit
–
3
*2
– – –––– –
M 8375
*1
[Y003] DOG signal logic reverse –
3
*2
– – –––– –
M 8376
*1
[Y003] Zero point signal logic reverse –
3
*2
– – –––– –
M 8377
*1
[Y003] Interrupt signal logic reverse –
3
*2
– – –––– –
[M]8378 [Y003] Positioning instruction activation
–
3
*2
– – –––– –
M 8379
*1
[Y003] Pulse output stop command –
3
*2
– – –––– –
RS2 (FNC 87) [ch0] [FX3G PLCs] (Refer to Data Communication Edition for details.)
[M]8370 Not used
– – – – –––––
[M]8371
*1
RS2 (FNC 87) [ch0] instruction: Send wait flag 3 – – – –––– –
M 8372
*1
RS2 (FNC 87) [ch0] instruction: Send request 3 – – D8372 – – – – –
M 8373
*1
RS2 (FNC 87) [ch0] instruction: Receive complete
flag
3 – – D8373 – – – – –
[M] 8374 to [M] 8378 Not used
– – – – –––––
M 8379
RS2 (FNC 87) [ch0] instruction: Time-out check
flag
3 – – – –––– –
*1. Cleared when the PLC switches from RUN to STOP.
*2. Available only when two FX
3U-2HSY-ADP units are connected to an FX3U PLC.
High Speed Counter Function (Refer to Subsection 4.7.5 for details.)
[M]8380
*3
Operation status of C235, C241, C244, C246, C247,
C249, C251, C252, and C254
– 3 3 – –––– –
[M]8381
*3
Operation status of C236 – 3 3 – –––– –
[M]8382
*3
Operation status of C237, C242, and C245 – 3 3 – –––– –
[M]8383
*3
Operation status of C238, C248, C248 (OP), C250,
C253, and C255
– 3 3 – –––– –
[M]8384
*3
Operation status of C239 and C243 – 3 3 – –––– –
[M]8385
*3
Operation status of C240 – 3 3 – –––– –
[M]8386
*3
Operation status of C244 (OP) – 3 3 – –––– –
[M]8387
*3
Operation status of C245 (OP) – 3 3 – –––– –
[M]8388 Contact for high speed counter function change
3 3 3 – –––– –
M 8389 External reset input logic reverse
– 3 3 – –––– –
M 8390 Function changeover device for C244
– 3 3 – –––– –
M 8391 Function changeover device for C245
– 3 3 – –––– –
M 8392 Function changeover device for C248 and C253 3 3 3 – –––– –
*3. Cleared when PLC switches from STOP to RUN.
Interrupt Program
[M]8393 Contact for delay time setting
– 3 3 D8393 – – – – –
[M]8394 HCMOV (FNC189): Drive contact for interrupt program – 3 3 – –––– –
[M]8395 Function changeover device for C254
3 – – – –––– –
[M]8396
Not used
– – – – –––––
[M]8397
– – – – –––––
Ring Counter
M 8398
Ring counter operation (in units of 1ms, 32 bits)
*4
3 3 3
D8398,
D8399
–––– –
[M]8399 Not used
– – – – –––––
*4. 1ms ring counter (D8399, D8398) will operate after M8398 turns ON.
Number and name Operation and function
Applicable model
FX
3G FX3U
FX
3UC
Correspond-
ing special
device
FX
1S
FX
1N
FX
2N
FX
1NC
FX
2NC