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First of all, thank you for your response. I also tried uploading the program in this way before, but halfway through the upload process, the progress bar would suddenly show an error and the upload would fail. And I also attempted to connect my personal notebook directly to the PLC via a USB cable, ...

The program had been able to be monitored and modified online before a certain date. However, after that date, when I attempted to make it online, an error was prompted and the upload of the program failed. Could you please tell me what caused this? EDIT: moved to Automation Control community -FL ...