Chapter 11 Datalog Function
11.3.2 Data Save Method
The datalog function saves data using one of the three methods that follows.
(1) Regular Save
Regular Save refers to saving data at main task or at a set interval That is, data at the time of save condition are
saved, without considering the status before or after the save condition. This method is useful for collecting certain
data at a certain interval.
Time
Data
Save condition
occurrence
Save condition
occurrence
Save condition
occurrence
Current
value: 100
Current
value: 60
Current
value: 120
When a comparison condition occurs,
the data is saved
(2) Trigger Save
Trigger Save refers to saving a set number of data before and after the relevant point: the number of data are set
by parameter. This method is useful when you want to view data from a certain period before and after a certain
event.
Time
Data
Save condition
occurrence
Save condition
occurrence
When a comparison condition occurs,
the data of before and after value is saved
Trigger Trigger
Before value
After value
Before value
After value