Mitsubishi Electric MELSEC iQ-R Series - Condition Specification

20 DATA LOGGING FUNCTION
20.4 Data Collection Conditions
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Condition specification
Specify the data collection timing according to the device data conditions and step number. The AND condition using a
combination of "Device specification" and "Step No. specification" results in the collection of data at the time when both
conditions are established.
Device specification
Data are collected when the monitored data meets the specified condition during the END processing.
■To collect data continuously while the conditions are met
The following conditional formula causes the data logging function to collect data continuously while the conditions are met:
• =: When the current value of the monitored data is equal to the comparison value
• : When the current value of the monitored data is not equal to the comparison value
• : When the current value of the monitored data is equal to or larger than the comparison value
• >: When the current value of the monitored data is larger than the comparison value
• : When the current value of the monitored data is equal to or smaller than the comparison value
• <: When the current value of the monitored data is smaller than the comparison value
■To collect data only when the state changes
The following conditional formula causes the data logging function to collect data only during the END processing for the
scans where the conditional formula is met. It does not collect data for any single scan where the conditional formula is not
met during the END processing (even if the conditional formula is met before the END processing is initiated).
• : When the specified data turns on
• : When the specified data turns off
• At change: When the current value of the specified data changes
(1) During the END processing, the data logging function does not collect data because the conditions are not met.
(1) The data logging function does not collect data because there has been no change in state since the last scan.
0 END 0 END 0 END 0 END 0 END
(1)
1 scan
Program
END processing
Sampling
END processing
Sampling
END processing END processing
Word value Set value ≠ Current value Set value ≠ Current valueSet value = Current value
END processing
0
END 0 END 0 END 0 END 0 END
(1)
Word value
1 scan
Program
END processing
Sampling Sampling
END processing END processing END processing END processing
Set value = 0 (initial value) Set value = 2Set value = 1