Mitsubishi MELSEC-Q Series User Manual page 246

6 FUNCTIONS
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POINT
(1) Depending on the setting of the tag sampling interval and logging timing, the
data accumulated for up to the time length of the tag sampling interval are
logged.
(Example) When the tag sampling interval is 10 seconds and the logging
interval is 1 second, the tag data of up to 10 seconds earlier is
logged.
(2) By selecting "Sampling: Update before logging." in the tag setting, tag data
can be collected in synchronization with the logging timing.
(3) By selecting "Same as the tag sampling interval" in the timing setting, logging
can be performed at the tag sampling interval.
(e) Condition for Start ( 1)
As the condition for starting logging, select any of the following.
1) Start at start-up.
• Logging starts when the Update button on the Setting update screen
is clicked, or when the programmable controller is powered off and
then on, or the CPU module is reset.
• Select this item for continuous logging.
2) Do not start.
• Logging is not started.
• Select this item when performing logging using the dedicated
instruction LOG, or when making setting only and not executing
logging.
3) Start at the specified time after event occurrence.
Logging is started when the specified time (second) has elapsed after
the specified event occurred.
1) Select any of the event types.
2) Select the event setting number.
3) Set the logging start time.
(Specify "0" when starting logging at event occurrence.)
POINT
When above 3) is set as the condition for start and the event set to the condition for
start occurs twice before the specified time passes, the first event is valid as the
condition for start.
(Example) When the condition for start is set to 10 seconds after event occurrence
Event
Occurrence
Logging
1)
Occurrence
10 seconds
Start
MELSEC-Q
2) 3)
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