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(2) System information
Number
Name
SM203
STOP contact
STOP status
Clock data set
OFF : Ignored
SM210
request
ON : Set request
OFF : No error
SM211
Clock data error
ON : Error
Clock data read
OFF : Ignored
SM213
request
ON : Read request
OFF : Within the number
Number of
of writes
SM232
writes to ROM
ON : Over the number of
writes
(3) System clocks/counters
Number
Name
ON
SM400
Always ON
OFF
ON
SM401
Always OFF
OFF
After RUN, ON
ON
SM402
for 1 scan only
OFF
After RUN, OFF
ON
SM403
for 1 scan only
OFF
0.1 second
0.05s
SM410
0.05s
clock
0.2 second
0.1s
SM411
0.1s
clock
0.5s
SM412
1 second clock
0.5s
1s
SM413
2 second clock
1s
2n second
ns
SM414
ns
clock
(4) Safety CPU
Number
Name
OFF : Other than TEST
TEST MODE
SM560
MODE
flag
ON : TEST MODE
Continuous
OFF : Within the setting
RUN of
time
SM561
tolerance time
ON : Over the setting
setting for the
time
TEST MODE
TableApp.2.3 Special relay
Meaning
• Turns ON when the CPU is in STOP status.
• Writes clock data stored in SD210 to SD213
to the CPU module after the END instruction
of the scan where the relay changes OFF to
ON has been executed.
• Turns ON when an error is detected in the
clock data (SD210 to SD213) and turns OFF
if no error is detected.
• Reads clock data to SD210 to SD213 in BCD
value when the relay is ON.
• Turns ON when the number of writes to ROM
exceeds 100,000.
TableApp.2.4 Special relay
Meaning
• Normally is ON
• Normally is OFF
1 scan
• After RUN, ON for 1 scan only.
• After RUN, OFF for 1 scan only.
1 scan
• Repeatedly changes between ON and OFF
at each designated time interval.
• When PLC power supply is turned OFF or a
CPU module reset is performed, goes from
OFF to start.
• This relay alternates between ON and OFF at
intervals of the time (unit: s) specified in
SD414.
• When PLC power supply is turned OFF or a
CPU module reset is performed, goes from
OFF to start.
TableApp.2.5 Special relay
Meaning
• Turns ON when operating on the TEST
MODE.
• Turns OFF when operating on the other
mode (SAFETY MODE, SAFETY MODE
(wait-for-restart)).
• Turns ON when the continuous RUN of
tolerance time set for the TEST MODE in the
parameter is exceeded.
Explanation
(When Set)
S (Status change)
S (Request)
Explanation
(When Set)
S (Every END)
S (Every END)
S (Every END)
S (Every END)
S (Status change)
S (Status change)
Explanation
(When Set)
S (Status change)
Appendix 2 SPECIAL RELAY LIST
Set by
Corresponding
CPU
U
QS
U
S (Error)
Set by
Corresponding
CPU
QS
Set by
Corresponding
CPU
QS
S (Error)
App-13
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