making a slideshow by wincc

[Thomas_v2]

you can look at the attached 3 pictures and you will find the final code.

Two comments:

1)
If you add picturenames with defines, you should place the define between the associated WINCC... START/END comments.
If you use a picture names:

// WINCC:PICNAME_SECTION_START
#define PIC_1 "myPic1.pdl"
// WINCC:PICNAME_SECTION_END

The same when you use tags inside a C script.

// WINCC:TAGNAME_SECTION_START
#define TAG_1 "myTag1"
// WINCC:TAGNAME_SECTION_END

Otherwise searching and replacing of tags or picture names will not work.

2)
I would use a switch/case statement instead of if-then.

switch (val) {
  case 0: 
    OpenPicture(PIC_1);
    break;
  case 1: 
    OpenPicture(PIC_2);
    break;
  case 2: 
    OpenPicture(PIC_3);
    break;
}

For your if-then statement, if you have 22 conditions and one is true, the others are also checked unnecessary.
A switch statement is if there are consecutive case-values, compiled into a jump-table, which is fast and efficient.
And that's the common used way in C.

 

[Ghourab]

Thanks for Eng. Tomas

Thank You Eng. Thomas for your valuable information.

 

[Ghourab]

The Internal Binary tag which can stop the slideshow by making a button while pressed set slideshow value equal 1000 for example or what

 

[Thomas_v2]

The Internal Binary tag which can stop the slideshow by making a button while pressed set slideshow value equal 1000 for example or what

You can use a seperate tag to stop/start the slideshow. Then in the scripts where you change the picture you have to check the value of the tag, and when false then don't do the picture change.

You can do it using only the existing tag, like you mentioned set it to 1000 to stop. Then you have to modify to the global script, to that it does nothing when the value is == 1000.
Then you can use a button to toggle slideshow on and off, with code like this (pseudocode):

if (slideshow < 1000){
  /* stop slideshow */
  slideshow = 1000;
} else {
  /* start slideshow */
  slideshow = 1; /* use an appropriate value in each picture, that the slideshow proceeds with the next picture */
}