Hy all,

I would like to call an FC or FB only once from main Main OB1, how can I do it?
It's very important to run that FB or FC only once if I call it.

Sorry, I'am newbie.

Thank you,

Istvan

Hello Szob.istvan,

                                 U can just drag and drop ur subrouins in OB1. Its automaticaly Created DB's also . And u must call OB , then oly U FC or FB sholud scan .. 

Dear Arasan,

thank you your fast answer!

But how can I solve that, if I0.1 activated call FB1 but FB1 execute only once and in the next sequence of OB1 doesn't call again, despite I0.1 is activated.

Hi mister 2016 campaign kapo, it seems that you did not read very much what he wrote. He said once, not at every one shot rising, so he basically needs to run one fc or fb ONCE.

Take ur time in posting the red circle of 2016 campaign spam, kthx.

Solutions  : if u really want to run it once ( until next power off and on or run stop transition) just use a merker . You launch your fc or fb if you have the condition and if the memo merker is false. After you have launched it you set your merker at true, so nevermind that fc or fb will be ran again, unless somewhere else you at least reset that memo merker.

William_B

Let the guys tell you more about edge triggers.
(,,or search these forum pages for more)

Thank you,

I tried it, but it doesn't work (100% that I'am a ***) 
I don't know why...

Thank you your help!

 Szob, P is for ***s, for plc-gods .

Use r_trig if u need a trigger or my method if u need a more " one launch and stop" method

szob.istvan

Thank you,

I tried it, but it doesn't work (100% that I'am a ***) 
I don't know why...

Thank you your help!

Not angry with you, i do not know if you are a plc god , a forum moderator, a campaign motivator or just a super precise guy, German style, which does not allow a minimum margin of tolerance in the replies. Personally i suppose the first and the last since it is not the first time that your answers seems to irritate who reads, maybe For sarcsm, maybe For big heading , dunno. I come from Simotion world and maybe I have never estimated the 'just plc' pros.

So I answered, and gave two solutions. You just posted the SS of the help because of the lack of contents of your post where it is supposed that any mammal is able to press F1 and check what you suggested. So basically you say " use f_trig" and he goes searching what the hell ftrig is, then try it, and try again, without any code shared since it is a BASIC BASIC concept who is surely shown Also in LAD in the help.

OB100 ? I said ftrig and then previously a memo bit... OB100 here  is another thing that is meritable of your red circle...  Does not mean nothing with what i wrote and with what he needs, expert.

Let s go back to Automation, machine are all except philosophy, sir

szob.istvan

Thank you,

I tried it, but it doesn't work (100% that I'am a ***) 
I don't know why...

Thank you your help!

 From the screen shot it looks like it works. The FC is executed once every time I0.2 is switched on. It's very very brief, so you can miss that event when monitoring the program online. And if you judge this because what you expect the FC to do, didn't happened, the problem can be the FC code.