cataliz3er Posted September 12, 2013 Report Share Posted September 12, 2013 Hello, I am using a Vision 570 for monitoring a number of temperatures, and I need a way to log the information. I tried the sample "SD Card: Trend Read/Write/Append" but the problem is that in case of a power outage, I lose the information in the segment. Is there a way to prevent this? I was thinking of saving the temperatures to a data table, but then how do I display it on the trend? If this has already been discussed, my appologies, and please redirect me. Many thanks, Catalin Pop Quote Link to comment Share on other sites More sharing options...
MVP 2014 Simon Posted September 13, 2013 MVP 2014 Report Share Posted September 13, 2013 If you want maximum flexibility I would suggest setting up a dual logging arrangement. That is, set up a data table log in parallel with the trend, and log the same values using both methods. Use the trend to put the values on the screen, and save history. Then use the datatable as a backup, where you can hold a buffer of data on the PLC and only delete if after you confirm it has been copied to the SD card. There is no way that I am ware of where you can take data table information and load it back into a trend function. However at least you would have the data and could retrieve it and view in Excel (or similar). Quote Link to comment Share on other sites More sharing options...
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