What have you already gotten to work?  Can you get the digital input to turn the LED on 100%, and then press it again to turn it off (0%)?

If you cannot get that far on your own, what is stopping you?

LoganSquare

Hey,
I'm looking for a sample program for controlling a
LED dimmer (0-10V) by a simple button with my s7-1200.
I would like to control the dimmer with a digital input 
and an analog output.

short push on / off (0-100%) long push dimming up / down 
(from 0 to 100%)
thanks

Ok, so this is not a school assignment, and you are actively working the problem and making progress.

Consider what the pushbutton is really doing.

It is counting from 0 to 1 (short push).  Next short push counts from 1 to 2.  The PLC sees a "2" and has to make a decision.  What does 2 mean for an "On" "Off" situation?  Does it mean reset it to 0?  Or does it mean do some MOD math to determine if the count is even or odd and then deal with number rollover when it hits counter datatype's max value?  Hmm, I wonder which is easier and simpler and does not matter how PLC manufacturer handles datatype rollover?

As for the long press, how do you detect a long press?  Button obviously pressed longer than a short press plus some buffer time to make it feel more intuitive to the user.

Once the buffer time has expired and long press has been detected, what does the button do while held?

If the value is 0%?  100%? 50%?  Does it need to remember the last direction so it can continue in that direction?  Or, do you add a 3rd action, double tap where the 2nd tap is the long press, but instead of remembering the prior dim direction, it reverses the remembered direction and then starts dimming once the 2nd action of the long press is recognized.

How would someone detect a button has been pressed as "short", "long"?  A timer for "short" and a timer for "long" seems appropriate.

If "short" timer times out and "long" timer does not time out, is that the definition of a short press?

If "long" timer times out, we know it's a long press and definitely not a short press, right?

As for dimming, you need to realize human time and PLC time are 2 very different time ranges.  PLC act in msec where as humans and real world feedback (dim level changes) should operate in the 100msec (0.1s) time frame - or "s l o w e r".

So, while the long press timer has timed out, now you need to act periodically every x msec to adjust the dim level by some set amount - presumably at the same resolution as the LED dim control - often 0-255.  So, 255 steps.  How long should long press take from 0 to 100%?  Divide that up by the LED dim level smallest useful increment and then when the long timer's elapsed time exceeds established DIM increments in msec, adjust the dim level once.

Let's see how far that set of ideas / concepts / questions takes you.  Please post your results / plc logic as you make steps towards your goal(s).  Like "I got the short push toggle working" screenshot...

LoganSquare

Einstein,

For now i can turn on/off my di with a push, i can set my AO to 0/100%. But i dont know how to start to know wich type of push is applied. Do i have to use a TON ? 

To qwazee,

I didn't want to get a free program, you can't work for everyone i know. My bad.

I started TIA 4 days ago, i used it in my sudies but it was few years ago.

I'm gonna try my best and i'm searching every day to improve myself.

there is program (the FC2 is just a norm_x/scale_X, i didn't want to write it 2 times)

By the way, there are a great many ways to implement your proposed (re)learning project.  If my comments steer you away from an approach that you feel less comfortable with, I'll not be offended by seeing a different style solution.  In fact, I would appreciate it even more because it means you are acting more independently and seeing through the obvious pitfalls I left dangling in my thought provoking and perhaps even laugh inducing questions.

LoganSquare

thank you for the guide line 

I gonna try this, and as you said, comming back to publish my progression