Dear All,

I am attaching with this subject diagnosis of S7-400 which is in stop mode and EXTF and REDF led is in on condition.

Dear All kindly suggest what can be a possible solution.

Especially 8186 error I don't understand, if anyone has any idea kindly let me know.

Thanks in advance.

Salim

Hello Dear,

Thanks for the quick reply!

Yes memory resets were done and uploading activity was not done.

As I understand, after Mset switch is pressed continue after master and slave get sync in auto, and no need to download the program in the CPU.

Anyway, kindly let me know now how to normalize and take CPU again in run mode.

Thanks in Advance.