Hallo,

I wanna do some calculations in accordance with some conditions. I have managed to make s7-1200 to do that. But i want it to do those calsulations after system start button is pressed. It does even if it is not pressed. What is wrong with attached program?

Thanks in advance

Depends how your system start operates.  I notice that it is defined twice.

The preferred method to do rising edge detection for your start and run the code on the rising edge.

Did you try with add first "Always False" contact ?   

If the problem about merker you can find it with this way..

Hi Jeff Casagrande,

I want to control it with a start button. I dont know how i can make it rising edge 
System start is defined twice but i dont thing it can create problem. Please check the pic below. It is starting of the program.

Hi caki3000,

Can u please help me finding "always false" contact in the program? 

There are several ways.  I have attached one

Your SytemStart(2) is a maintained contact, so the PLC is doing exactly what you are asking it to do.  It also will never turn off, so I think you need to take two steps backwards and figure out what you are actually trying to do.

Firstly; Open Device. Conf. and chose PLC CPU's Properities Page. In there active System and Clock Memory Words. Then you can use Always False option in contacts..

Lets try with that and see that is the problem fixed ? 

 Translation from the Turkish (provided by Google Translate):

Hello caki;

Thank you  for helping out the OP, but it would be appreciated if you added an English translation to your post so all members of the Siemens forum can understand it.

Regards,

Daniel Chartier

caki3000

You Türksan I think, the first time I needed help on this forum .. our own language,

Enter Device Conf. to. PLC properities to please both word came from thence active and Clock System Memory section. Then already will automatically choose when you write False Always come to a contact.

This way you active. Let's see if we get the same results, in doing so?

Good luck.

Dear Jeff Casagrande and caki3000,

thank you for your suggestions.

I will try both ways and tell the result.