Data Logging on Event base

[Hemendra]

Hi,

How can I make Data Logging on Event base, mean want to log data based on condition of PLC tag on which I connected, not on time interval. Thank you.

[AzeoTech]

The easiest way is to create an export set where each expression has [0], so myChannel[0], then in the Event for the channel, use an if() statement to evaluate your condition and run the export set if its true:

if (myChannel[0] > 5)
   beginexport(myExport)
endif

[Hemendra]

ok, I worked with Export. One difficulty is there, it is exporting data hundreds of time (some times in thousands) even logic condition turn False to True. I want it to be done single time, second export again on logic condition False to True.

[Hemendra]

I mean data export to be done once on logic condition turns False to True every time.

[AzeoTech]

You need to make sure every line of your export set has [0] so it only writes the most recent data point.