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9
EMC AND LOW
VOLTAGE
DIRECTIVES
10
LOADING AND
INSTALLATION
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MAINTENANCE AND
INSPECTION
12
TROUBLESHOOTING APPENDICES INDEX
12
TROUBLESHOOTING
12.6 Special Relay List
12 - 80
(3) System clocks/counters
Table12.14 Special relay
Number Name Meaning Explanation
Set by
(When Set)
Corresponding
CPU
SM400 Always ON • Normally is ON S (Every END)
QS
SM401 Always OFF • Normally is OFF S (Every END)
SM402
After RUN, ON
for 1 scan only
• After RUN, ON for 1 scan only. S (Every END)
SM403
After RUN, OFF
for 1 scan only
• After RUN, OFF for 1 scan only. S (Every END)
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.
S (Status change)
SM411
0.2 second
clock
SM412 1 second clock
SM413 2 second clock
SM414
2n second
clock
• This relay alternates between ON and OFF at
intervals of the time (unit: s) specified in SD414.
(If the value of SD414 is changed, the time that
has passed after the previous ON/OFF interval
of SM414 is counted as the next interval, and
the ON/OFF status is changed at the next
interval that is newly specified.)
Example: When the value of SD414 is changed
from 3 to 10.
• When programmable controller power supply is
turned ON or a CPU module reset is performed,
goes from OFF to start.
S (Status change)
ON
OFF
ON
OFF
ON
OFF
1 scan
ON
OFF
1 scan
0.05s
0.05s
0.1s
0.1s
0.5s
0.5s
1s
1s
ns
ns
SM414 OFF
3
seconds
3
seconds
The time that has passed after the
previous ON/OFF interval of SM414
is counted as the next interval.
10
seconds
10
seconds
ON
SD414 3 10
Change of the value