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888
FX
3G
/FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
37 Operation of Special Devices (M8000 -, D8000 -)
37.1 Special Device List (M8000 -, D8000 -)
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.
RS2 (FNC 87) [ch1] (Refer to Data Communication Edition for details.)
[M]8400
Not used
–
–
–
–
–
–
–
–
–
[M]8401
*1
RS2 (FNC 87) [ch1] Send wait flag
3
3
3
–
–
–
–
–
–
M 8402
*1
RS2 (FNC 87) [ch1] Send request
3
3
3
D8402
–
–
–
–
–
M 8403
*1
RS2 (FNC 87) [ch1] Receive complete flag
3
3
3
D8403
–
–
–
–
–
[M]8404
RS2 (FNC 87) [ch1] Carrier detection flag
3
3
3
–
–
–
–
–
–
[M]8405
RS2 (FNC87) [ch1] Data set ready (DSR) flag
3
3
*2
3
*2
–
–
–
–
–
–
[M]8406
Not used
–
–
–
–
–
–
–
–
–
[M]8407
–
–
–
–
–
–
–
–
–
[M]8408
–
–
–
–
–
–
–
–
–
M 8409
RS2 (FNC 87) [ch1] Time-out check flag
3
3
3
–
–
–
–
–
–
*1.
These devices are cleared when the PLC mode switches from RUN to STOP or when the RS2
instruction [ch1] turns OFF.
*2.
Available in Ver. 2.30 or later.
Number and name
Operation and function
Applicable model
FX
3G
FX
3U
FX
3UC
Correspond
-ing special
device
FX
1S
FX
1N
FX
2N
FX
1NC
FX
2NC