I have a two way valve that control heating of two water tanks.

Tank 1 should have 53 degrees at all times.

Tank2 if this drops below 30 degrees Q3 should be activated.

If Tank 1 drops below 53 degrees then Q3 should be inactive and when Tank 1 reach 53 degrees Q3 should be activated again to Tank 2 reach 30 degrees.

Of course when tank 2 reach 30 it Q3 should be inactivated.

I need some help on this I nearly get it to work but not with satisfaction.

In my programming it work like above but when Tank 1 drops 4 degrees it inactivate Q3 but when Tank 1 Increases 1 degree it activate Q3 Direct again

Please look at attachment..

/Chris 

Thanks it seams that this is working like I wanted...

Yes very thank you very much IXO65.

Now I got another problem

In the same program, I try to get a second function or third.

If Tank 1 continue dropping more then the 4 degrees I want a another relay be activated.

up to the 53 degrees that's max for tank 1. For example if Tank 1 drop 7 degrees it should activate second relay. I must be able to change value of this dropping.

I don't know if I need more PT100 or I can integrate this in first function?

Please some help try to learn about this..

You are amazing you help me a lot.

Thank you very much IXO65. Now I understand little more about this with temp control always nice to have a example to work with that's made by a pro.

I hope I can come back to you on next problem I am stuck with...

Hello again IOX65.

Now I try put program in to Logo 8 work fine. But when I try to get webserver work my browser on tell can find page. I have enable webserver, but don't work. I think I must put a hours count in program to get webserver work but not sure, anyway I don't have any ide how to put this in program.

Please help me...