Mitsubishi MELSEC Q Series Programming Manual page 1230

(3) System clock/counter
Number Name Meaning
Number of
1 second
SD412 counts in 1-
counter
second units
2n second 2n second
SD414
clock setting clock units
2nms clock 2nms clock
SD415
setting units
Number of
SD420 Scan counter counts in each
scan
Number of
Low speed
SD430 counts in each
scan counter
scan
App-222
Explanation
• This register is incremented by 1 for each second after the
CPU module is set to RUN.
• Count repeats from 0 to 32767 to -32768 to 0
• Stores value n of 2n second clock (Default is 30)
• Setting can be made between 1 and 32767
• Stores value n of 2nms clock (Default is 30)
• Setting can be made between 1 and 32767
• This register is incremented by 1 for each scan of a scan
execution type program after the CPU module is set to RUN.
(Not incremented for each scan of an initial execution type
program.)
• Count repeats from 0 to 32767 to -32768 to 0
• This register is incremented by 1 for each scan after the CPU
module is set to RUN.
• Count repeats from 0 to 32767 to -32768 to 0
• This register is incremented by 1 for each scan of a low-
speed execution type program after the CPU module is set to
RUN.
• Count repeats from 0 to 32767 to -32768 to 0
• Used only for low speed execution type programs
Corres-
ponding
Set by
ACPU
(When Set)
D9
S
(Status D9022
change)
U
New
S
(Every END Q00J/Q00/Q01
processing)
Corres-
ponding
CPU
QCPU
LCPU
Qn(H)
QnPH
QnPRH
QnU
LCPU
Qn(H)
QnPH