Mitsubishi Electric MELSEC iQ-R Series User Manual page 265

Step No. specification
Data are collected when the specified condition is met immediately before the execution of the specified step.
■To collect data continuously while the execution conditions are met
The following execution conditions cause the data logging function to collect data continuously while the execution condition
are met:
• Always: The specified step is executed regardless of the state immediately before the execution of it.
• In the specified condition satisfied: The specified step is executed if the state immediately before the execution is a running
state.
• In the specified condition not satisfied: The specified step is executed if the state immediately before the execution is not a
running state.
Status just before Execution
the execution of
Not
the specified step
execution
0
Program
(2)
■To collect data only when the execution conditions are met
The following execution conditions cause the data logging function to collect data only when the execution conditions are met:
• On the rising edge of the specified condition: The specified step is executed if the state changes from non-running to
running immediately before the execution of it.
• On the falling edge of the specified condition: The specified step is executed if the state changes from running to non-
running immediately before the execution of it.
Status just before Execution
the execution of
Not
the specified step
execution
0
Program
If the specified step is contained between FOR and NEXT loop of instructions, the data logging function
collects the data for only the first iteration of the loop where the specified conditions are met.
Since the step number cannot be checked in the following programs, the step number cannot be specified.
• Program having multiple parts
• ST program
• FB program
• SFC program
(1)
END 0 END
END processing END processing
Sampling
(1)
END 0 END
END processing END processing
Sampling
(1) The data logging function collects data
(1)
(2) It does not collect data because the state
0 END 0
END processing
Sampling
(1) The data logging function collects data
(2) The data logging function does not collect
0 END 0
END processing
(2)
20 DATA LOGGING FUNCTION
20.4 Data Collection Conditions
because the state immediately before the
execution of the specified step is a
running state.
immediately before the execution of the
specified step is not a running state.
because the state changes from running
to non-running immediately before the
execution of the specified step.
data because there has been no change
in state since the last scan.
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