Chapter 11 Datalog Function
(3) Event Save
Event Save refers to monitoring the device value collected, and saving the present data when a certain event
condition is satisfied. This method is useful for analyzing fluctuation of event values and timing by saving data
from the event occurrence to the event termination.
Time
Data
Save condition
occurrence
When a comparison condition occurs,
the data is saved
Event
Event data value
Recovery
Save condition
occurrence
Event
Event data value
Recovery
11.3.3 Data Sampling Condition
The datalog function classifies the data save conditions and intervals as follows, depending on the parameter setting.
(1) Regular Save
The following are condition setting items for Regular Save.
Data are saved after End of each main task
Data are saved after END of each main task after lapse of set time
Data are saved after END of each main task after lapse of set time
(a) Save at every scan
When using the scan interval save method, data are collected after END of each main task. If the volume of
stored data is large, a scan watchdog timer error may occur.