Mitsubishi Electric MELSEC-L Series - CHAPTER 4 PROCEDURES BEFORE OPERATION

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CHAPTER 6 DATA LOGGING FUNCTION
6
6.2 Sampling of Target Data
(3) Condition specification
Data are collected when the state of the specified device or step meets the specified condition. Furthermore, if
both of (a) and (b) are selected, an AND condition can be created.
(a) Device specification
Data are collected when the specified device condition is met in the END processing of each scan.
<Data are continuously collected while the condition is satisfied.>
While the condition of the specified device is met, device data are collected in the END processing of each
scan. Set the following.
• When the word device value meets the specified value: When the current value of the specified device is
changed
When the word device value meets the specified value
<Data are collected only when the status is changed>
Device data are collected only in the END processing of the scan where the specified device condition is
changed. Select one from the following.
• When the bit of the bit device rises: When the specified device is turned on
• When the bit of the bit device falls: When the specified device is turned off
• When the word device data is changed: When the current value of the specified device is changed
When the word device data is changed
Ex.
Condition not met
1 scan
Condition not met
Program 0 END
END processing
Sampling
0 END
END processing
Sampling
0 END
END processing
0 END 0 END
END processing END processing
Condition met
Data are not sampled because the
condition is not met at END processing.
Specified condition
Ex.
Specified condition
1 scan
Program
0 END
END processing
Sampling
0 END
END processing
0 END
END processing
0 END 0 END
END processing END processing
Condition occurred
Data are not sampled because the status did not change
after the previous sampling.