Sampling Function - Mitsubishi Electric MELSEC iQ-R Series User Manual

Sampling function

This function samples target data from the access target CPU module.
The data sampling methods are as follows. The sampling interval that can be specified differs depending on the data sampling
method.
Data sampling method
High speed Each scan
sampling
Time specification
General sampling Time specification
Time interval
specification
• In order to perform high speed sampling, a CPU module which supports the high speed sampling function is
required.
• The data logging, event logging, and report functions of a high speed data logger module are best effort
functions.
Since the processing time of a module varies depending on the setting and the status of other devices,
these functions may not perform at the set sampling interval.
Run the system by fully verifying the processing time of each function when constructing it.
• Data changes occurred between the data sampling processes are not sampled because the high speed
data logger module samples the data only at the specified sampling interval. (Page 418 Sampling
Processes of High Speed Data Logger Module)
Overview
Data is sampled in each sequence scan of a CPU module.
Data is sampled at a specified interval (in milliseconds).
Data is sampled at a specified interval (in seconds).
Data is sampled at a specified time interval (hour, minute, or second)
from exactly midnight everyday, exact hour, or exact minute.
Reference
Page 27 Timing of data sampling
when "Each scan" is specified
Page 27 Timing of data sampling
when "Time specification" is specified
Page 28 Timing of data sampling
when "Time specification" is specified
Page 28 Timing of processing when
"Time interval specification" is
specified
1 FUNCTION
1.1 Data Logging Function
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