I'd like to ask your help for file operations.
I want to write a variable's value daily with date into a file (append each day with a row) and then after a time compare the latest value with an avarage value of specified timespan (for example a month/30 days).
The file should look like this:
2022-10-20,45667 2022-10-21,22344 ... ... 2022-11-20,4432
so after a month passed (for example) I want to avarage the of the values compared to the last current one.
I tried file operation library but I couldn't get them working, even after reading the manual. I have problem accessing the variable's memory address (it's a retain one) and using the functions, function blocks to writing and reading back the file.
This question is pending...