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App-127
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Appendix 3 SPECIAL RELAY LIST
(3) System clocks/counters
TableApp.3.4 Special relay
Number Name Meaning Explanation
Set by
(When Set)
Corres-
ponding
ACPU
M9
Corresponding
CPU
SM400 Always ON • Normally is ON
S (Every END
processing)
M9036
QCPU
SM401 Always OFF • Normally is OFF
S (Every END
processing)
M9037
SM402
After RUN, ON for 1
scan only
• After RUN, ON for 1 scan only.
• This connection can be used for scan execution type
programs only.
• When an initial execution type program is used, this
relay turns OFF at the END processing of the scan
execution type program in the first scan after RUN.
S (Every END
processing)
M9038
Qn(H)
QnPH
QnPRH
QnU
• After RUN, ON for 1 scan only.
S (Every END
processing)
New Q00J/Q00/Q01
SM403
After RUN, OFF for 1
scan only
• After RUN, OFF for 1 scan only.
• This connection can be used for scan execution type
programs only.
• When an initial execution type program is used, this
relay turns OFF at the END processing of the scan
execution type program in the first scan after RUN.
S (Every END
processing)
M9039
Qn(H)
QnPH
QnPRH
QnU
• After RUN, OFF for 1 scan only.
S (Every END
processing)
New Q00J/Q00/Q01
SM404
Low speed execution
type programON for 1
scan only after RUN
• After RUN, ON for 1 scan only.
• This connection can be used for low speed execution type
programs only.
S (Every END
processing)
New
Qn(H)
QnPH
SM405
Low speed execution
type programAfter
RUN, OFF for 1 scan
only
• After RUN, OFF for 1 scan only.
• This connection can be used for low speed execution type
programs only.
S (Every END
processing)
New
SM409 0.01 second clock
• Repeatedly changes between ON and OFF at 5-ms
interval.
• When Programmable Controller power supply is
turned ON or a CPU module reset is performed,
goes from OFF to start.
(Note that the ON-OFF status changes when the
designated time has elapsed during the execution of
the program.)
S (Status change) New
Qn(H)
QnPH
QnPRH
QnU
SM410 0.1 second clock
• Repeatedly changes between ON and OFF at each
designated time interval.
• When Programmable Controller power supply is
turned ON or a CPU module reset is performed,
goes from OFF to start.
(Note that the ON-OFF status changes when the
designated time has elapsed during the execution of
the program.)
S (Status change)
M9030
QCPU
SM411 0.2 second clock M9031
SM412 1 second clock M9032
SM413 2 second clock M9033
SM414 2n second clock
• This relay alternates between ON and OFF at
intervals of the time (unit: s) specified in SD414.
• When Programmable Controller power supply is
turned ON or a CPU module reset is performed,
goes from OFF to start.
(Note that the ON-OFF status changes when the
designated time has elapsed during the execution of
the program.)
S (Status change)
M9034form
at change
ON
OFF
ON
OFF
ON
OFF
1 scan
ON
OFF
1 scan of scan
execution type
program
Initial
execution
type program
ON
OFF
1
scan
ON
OFF
1 scan of scan
execution type
program
Initial
execution
type program
ON
OFF
1
scan
ON
OFF
1
scan
0.005s
0.005s
0.05s
0.05s
0.1s
0.1s
0.5s
0.5s
1s
1s
ns
ns