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Error when downloading a program in a Freelance, model PM783F

We made a modification in the program. During the time we download the program in the CPU, the system stopped to work when the download sequence was at 50% completed. At this time, the error led on the CPU was active, and we were not able to ping the processor. So we asked to the operator to remove the power on the CPU and put it back. When the supply came back on the CPU, we observed that the download was completed. My question is how could we prevent that, becauce we can't stop the processor cause by a download error.

Thank you.