Mitsubishi Electric MELSEC iQ-F Series Training Manual page 118

System clock
The special relay about system clock is shown below.
R: Read only, R/W: Read/Write
No. Name
SM400 Always ON
SM401 Always OFF
SM402 After RUN, ON for one scan only
SM403 After RUN, OFF for one scan only
SM409 0.01 second clock
SM410 0.1 second clock
SM411 0.2 second clock
SM412 1 second clock
SM413 2 second clock
SM414 2n second clock
SM415 2n ms clock
SM420 Timing clock output 1
SM421 Timing clock output 2
SM422 Timing clock output 3
SM423 Timing clock output 4
SM424 Timing clock output 5
Description
ON
OFF
ON
OFF
ON
1 scan
OFF
ON
1 scan
OFF
0.005 s
0.005 s
0.05 s
0.05 s
0.1 s
0.1 s
0.5 s
0.5 s
1 s
1 s
n s
n s
n (ms)
n (ms)
n2 scan n2 scan
n1 scan
n2 scan n2 scan
n1 scan
n2 scan n2 scan
n1 scan
n2 scan n2 scan
n1 scan
n2 scan n2 scan
n1 scan
R/W
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
APPX
Appendix 1 Special Relay List
A
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