Hello Friends!

I have a problem and i hope you can help me with it!

I have an s7 200 CPU 226 ver.01.01 and TP700 panel, created in TIA Portal ver.12.(Communications profibus DP (X2) on the panel)

It works, but...I upload project from CPU. Make some changes there (I change  input I2.1 to I2.7) and then I download project to CPU. The program works, but communication with panel TP700 will lost. I have information "Connection disconnected:Connection_1, Station 2, Rack 0, Slot 0" when HMI is started and when I try to change any variable in HMI I got message "tag ..... not found". All output fields are "####"...Communication settings in CPU and project in TP700 are not changed. 

Why CPU lost communication with panel after download changes in the CPU??

Hope, you can help me.

Hello Gorobets,

You must also load the project on the panel in addition to the CPU.

If you have a backup loaded on the panel and you do not have the original project, you should not change tag names, IP addresses... because communication between the CPU and the panel will be lost.

Hello JBS98!

I have original project of TP700 in TIA Portal v12. So I must load it to the panel again and it will be works?

I change only one tag in the CPU. But i have lost communication generally between CPU and TP700 panel. ALL tags are "####" in the panel...

Yes, it has happened to me on occasions of changing a simple variable and losing the connection with the panel. I think it is because the old configuration is still loaded on the panel and since the variables do not match, it causes loss of communication.

Loading the project in the panel has solved it when it happened to me.

Yes! I reload HMI project to my TP700 Comfort panel. And communication with S7 200 CPU was restored. Its works!

Thank you JBS98 for help!