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APPENDICES
(3) System clock/counter
Number
Name
Meaning
Explanation
SD412
1 second
counter
Number of
counts in 1second units
• 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
SD414
2n second
clock setting
2n second
clock units
• Stores value n of 2n second clock (Default is 30)
• Setting can be made between 1 and 32767
SD415
2nms clock
setting
2nms clock
units
• Stores value n of 2nms clock (Default is 30)
• Setting can be made between 1 and 32767
Set by
(When Set)
Corresponding
ACPU
D9†††
SD420
SD430
Scan counter
Low speed
scan counter
Number of
counts in each
scan
Number of
counts in each
scan
S
(Status
change)
• This register is incremented by 1 for each scan of a lowspeed 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
QCPU
LCPU
U
Qn(H)
QnPH
QnPRH
QnU
LCPU
• 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
D9022
Corresponding
CPU
New
S
(Every END
processing)
Q00J/Q00/Q01
Qn(H)
QnPH
A
Appendix 3 Special Register List
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