[?]: plc s7-200 program has been loss

[thientai007]

Hello,

I have a problem with the programe of PLC S7-200 needed to be resolved.
A few days ago, I had programed a part for PLC S7-200 CPU221, but after some working days, this programed part has been loss without any causes.
Thus, I hope for the help from everybody.

Thanks so much.

[Dfcz]

Too long was off.
The problem is not solved.