Mitsubishi Electric MELSEC iQ-R Series User Manual page 29

■Timing of data sampling when "Each scan" is specified
Target data is sampled in each sequence scan time of a CPU module.
When a CPU module is stopped, target data is not sampled.
Sequence scan time
Step 0 END
END processing
Sampling
When "Each scan" is specified, scan time increases because of the data transfer from the CPU module to the high speed data
logger module.
For details on delay time, refer to the following:
Page 352 Influence on the sequence scan time
■Timing of data sampling when "Time specification" is specified
The target data is sampled in each sequence scan after passing the specified interval.
When the CPU module is stopped, the target data is sampled at each specified interval.
The data sampling timing differs depending on the specified interval and the sequence scan time of the CPU module.
• When the sequence scan time is shorter than the specified interval
The data is sampled after the first sequence scan of the CPU module for which the specified interval has elapsed.
Sequence scan time
Specified interval
Constant
• When the sequence scan time is longer than the specified interval
Data is sampled at each sequence scan time.
Sequence scan time
Specified interval
Constant
Sequence scan time Sequence scan time
0 END 0
END processing END processing
Sampling
Sequence scan time Sequence scan time
Specified interval
Constant
Sampling
Specified interval
Constant
Sampling
Sequence scan time
END 0 END
END processing
Sampling Sampling
Sequence scan time
Specified interval
Sampling
Sequence scan time
Specified interval
Sampling
Sequence scan time
0 END
END processing
Sampling
Sequence scan time
Constant
Sequence scan time
Constant
1 FUNCTION
1.1 Data Logging Function
1
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