With this property the trigger for logging a value can be configured. It can either be time
based (every value change is logged) or time based (a value sample is recorded cyclacly.
If Time Based is selected, the Timer Value can be used to configure the log period for the
selected variable.
Default value: Event Based
Possible values: Event Based or Time Based
Timer Value
Configure the log period in milliseconds for the selected variable if Log Trigger is set to
Time Based
Default value: 500ms
Possible values: 500ms ... 2147483647ms
The recorded log data can be copied to a PC and then be processed by a tool to make it
readable by e.g. a spreadsheet application.
Use the JavaScript function save2DGraphHistory to store the data on a USB drive.
Example JavaScript:
//Get path of mounted USB drive:
var usbMountPath = getVariableValue("@USBMountPath");
//Save history to target path. The 2D Graph has object ID 42
var result = save2DGraphHistory(42, usbMountPath);
if (true == result)
{
print("Copy 2D Graph history started");
}
else
{
print("Starting copy 2D Graph history FAILED");
}
Note that the copy progress can be observed via the Copy Progress Variable .
When saving the history, a new directory is created on the USB drive with the following
name: graph_hsitory_NAME_OF_2D_GRAPH
On the PC
After transfer is done, the data can be viewed and processed with the Graph History Tool.
Follow these basic steps to export the data into a CSV file that can be opened by a
spreadsheet application:
·
Press the browse button and select the graph history directory on the USB drive.
·
After the directory was selected, the data of each variable can be viewed in a table.
·
Press the Export button to select export options and then press OK to export the data
into one or more CSV files.
A detailed manual for the Graph History Tool can be viewed here .
Manual data processing
The data can also be processed by you own applications. The storage format is:
·
64Bit timestamp in milliseconds since 01-01-1970
·
32Bit integer value
All values in Little Endian format.
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