System Clock - Mitsubishi Electric MELSEC iQ-R Series User Manual

System clock

The following is the list of special relay areas relating to the system clock.
No. Name
SM400 Always On
SM401 Always Off
SM402 After RUN, ON for 1 scan
only
SM403 After RUN, OFF for 1
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 millisecond clock
APPX
652
Appendix 4 List of Special Relay Areas
Data stored
ON
OFF
ON
OFF
ON
1 scan
OFF
ON
1 scan
OFF
0.005s
0.005s
0.05s
0.05s
0.1s
0.1s
0.5s
0.5s
1s
1s
n s
n s
n ms
n ms
Details
Always On
Always Off
• This relay is on during only one scan after RUN mode
starts.
• This relay is enabled only for the scan execution type
program.
• This relay is off during only one scan after RUN mode
starts.
• This relay is enabled only for the scan execution type
program.
• This relay repeats on/off at 5ms intervals.
• This relay does not turn on/off per scan, but turns on/off
whenever the specified time interval is reached.
• The initial state when the CPU module is powered on or
reset is off.
• This relay repeats on/off at certain intervals.
• This relay does not turn on/off per scan, but turns on/off
whenever the specified time interval is reached.
• The initial state when the CPU module is powered on or
reset is off.
• This relay repeats on/off at certain intervals.
• This relay does not turn on/off per scan, but turns on/off
whenever the specified time interval is reached.
• The initial state when the CPU module is powered on or
reset is off.
• This relay repeats on/off at certain intervals.
• This relay does not turn on/off per scan, but turns on/off
whenever the specified time interval is reached.
• The initial state when the CPU module is powered on or
reset is off.
• This relay repeats on/off at certain intervals.
• This relay does not turn on/off per scan, but turns on/off
whenever the specified time interval is reached.
• The initial state when the CPU module is powered on or
reset is off.
• This relay repeats on/off at regular intervals specified in
SD414 (in units of seconds). (When the value in SD414
is changed, the elapsed time count that has started
when the ON/OFF state of SM414 last changed
continues, and the ON/OFF state changes when the
*1
new specified time is elapsed.
• This relay does not turn on/off per scan, but turns on/off
whenever the specified time interval is reached.
• The initial state when the CPU module is powered on or
reset is off.
• This relay repeats on/off at regular intervals specified in
units of milliseconds on the SD415. (When the value in
SD415 is changed, the elapsed time count that has
started when the ON/OFF state of SM415 last changed
continues, and the ON/OFF state changes when the
*1
new specified time is elapsed.
• This relay does not turn on/off per scan, but turns on/off
whenever the specified time interval is reached.
• The initial state when the CPU module is powered on or
reset is off.
Set by (setting
timing)
S (Power-on to RUN/
STOP to RUN/every
END)
S (Power-on to RUN/
STOP to RUN/every
END)
S (Status change/every
END)
S (Status change/every
END)
S (Status change)
S (Status change)
S (Status change)
S (Status change)
S (Status change)
S (Status change)
)
S (Status change)
)