PLC address error (S7-1200 - TP700 Comfort)

[NoName]

Hello all.

I'm working with a S7-1200 CPU, a TP700 comfort panel and 4 drives that are all connected through profinet.
I've started my project yesterday and have already made a few functions that are displayed on the panel. I'm using about 25 tags so far. But all of a sudden yesterday the panel started showing error messages for some tags.

TagName: PLC address error
Every time I add something in the Step7 logic a new tag gets this error message.
Has any one experienced a similar problem ? I'm going nuts because I can't work on, I'm stuck at this point now.

So far I have tried making a completely new project but it's the same problem.

Any help would be greatly appreciated.

Thanks in advanced.
Best regards.

 

[JRW]

You said "some tags"- so others work fine?
If so- then you might need to download datablocks etc.. to plc

If nothing works, then check HMI connection under "connections"
also go to "online access"
Is HMI and PLC IP there?

 

[NoName]

You said "some tags"- so others work fine?
If so- then you might need to download datablocks etc.. to plc

If nothing works, then check HMI connection under "connections"
also go to "online access"
Is HMI and PLC IP there?

I have rebuilt and downloaded countless times to the PLC, because I also thought that it has to be something that changed there and so the OP doesn't connect to the tag. It's strange that it also doesn't find some some peripheral inputs that can't change.
So far I've solved this by changing the tag properties. I've switched from the symbolic access to direct access. But this can't be the solution to change tags over and over again.

Best regards.