Dear Experts,

I'm woking on PLC S7-200 CPU224 with Memory, There's original program in CPU and I also have backup program. A month ago I had to put some additional program in original program and downloaded to PLC and it's been working fine. Until couple days ago the power supply unit went off, and when power supply came back there is an original program in the CPU instead of new program that I downloaded.

So, I tried download new program again after that I turned power off for awhile then turn it on the new program was gone, there's only original program running in CPU. I had done "Clear.. and Power-Up Reset" and download again and I tried Program Memory Catridge there's no error and new program in CPU running good but after power off and turned on the original program still running but my new one gone.

Please help what should i do about this issue?

Thank you in advance.

DearMarcjan,

Regards.