Mitsubishi Electric MELSEC iQ-R-R00CPU - System Clock; Special Relay Used for System Clock; Special Register Used for System Clock

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4 CLOCK FUNCTION
4.4 System Clock
4.4 System Clock
The system clock is turned on/off by the system or turns on/off automatically at the interval specified by the user.
Special relay used for system clock
Special relay used for system clock are as follows ( Page 810 System clock)
Precautions
• SM409 to SM415 (System clock) start to measure the time before the CPU module is switched to RUN. Therefore, the time
from the first scan after the CPU module has been switched to RUN until switching of the on/off state of the system clock
may not match the measurement time of the system clock.
Special register used for system clock
Special register used for system clock are as follows ( Page 850 System clock)
SM number 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
SM420 User timing clock No.0
SM421 User timing clock No.1
SM422 User timing clock No.2
SM423 User timing clock No.3
SM424 User timing clock No.4
SM440 On only initial I44 execution after RUN
SM441 On only initial I45 execution after RUN
SD number Name
SD412 One second counter
SD414 2n second clock setting
SD415 2n ms clock setting
SD420 Scan counter