NOP in STL - Step7

Pete.S. · Mar 3, 2016

Hi guys!

I was wondering why I've seen some guys put a lot of NOP in their STL code.

For example:

Code:

CALL FC4
NOP 0

What is the purpose of this? NOP doesn't do anything.

Thanks,
Pete

JRW · Mar 3, 2016

Change your view to LAD...then look
It was probably written in that

gclshortt · Mar 3, 2016

JRW is correct. These will get inserted in the code when switching between languages.

Pete.S. · Mar 3, 2016

Awesome, thanks!

DeKemp · Mar 3, 2016

Also if you have a very big FBD/LAD network. Switching it to stl and adding NOP 0 to the bottom will keep it in STL when you switch back to FBD/LAD. This is useful if you have dozons of or/and ports. IE:

Code:

A bla1
O bla2
...
...
O bla99
O bla100
= blop

NOP 0

Pete.S. · Mar 3, 2016

Also if you have a very big FBD/LAD network. Switching it to stl and adding NOP 0 to the bottom will keep it in STL when you switch back to FBD/LAD. This is useful if you have dozons of or/and ports. IE:

Makes sense. But if was compatible with both and you wanted it to show up default as STL (or LAD) would it be possible to change that?

In block properties there are "Created in Language" but it's read only...

mk42 · Mar 3, 2016

Pete.S. said:
Makes sense. But if was compatible with both and you wanted it to show up default as STL (or LAD) would it be possible to change that?

In block properties there are "Created in Language" but it's read only...

As far as I know, as long as the logic is compatible with both, it will open as whatever you used last.

DeKemp · Mar 3, 2016

Pete.S. said:
Makes sense. But if was compatible with both and you wanted it to show up default as STL (or LAD) would it be possible to change that?
In block properties there are "Created in Language" but it's read only...

You can switch between languages when you open the block. View>LAD/STL/FBD.
Or these shortcuts Ctrl+1 = LAD ,Ctrl+2 = STL, Ctrl+3 = FBD

mk42 said:
As far as I know, as long as the logic is compatible with both, it will open as whatever you used last.

Thats true, The block will display the last language which it was saved in. Networks that are not possible to be displayed in FBD/LAD will default to STL.

Sidenote: Always switch to FBD/LAD when adding variables to the temp area of a FB. When in STL it could cause problems with the local addres the auto generated stuff of the FBD/LAD networks.

mk42 · Mar 3, 2016

DeKemp said:
Sidenote: Always switch to FBD/LAD when adding variables to the temp area of a FB. When in STL it could cause problems with the local addres the auto generated stuff of the FBD/LAD networks.

^I want to emphasize this. It's super important. Step 7 sometimes warns you about it, but it is really easy to ignore.

DeKemp · Mar 3, 2016

This document might be in place here. http://www.slideshare.net/DMCChicag...-ten-programming-mistakes-slide-share-8588695
Note page 37, Very important when creating a new project!

Pete.S. · Mar 3, 2016

I liked the slide show! Symbolic priority - I say yes to that.

mk42 · Mar 3, 2016

DeKemp said:
This document might be in place here. http://www.slideshare.net/DMCChicag...-ten-programming-mistakes-slide-share-8588695
Note page 37, Very important when creating a new project!

I need to remember that link; it probably has a home in about half the "my first Siemens project" threads on this site, and most of the rest as well. Some things are so much better explained with pictures than via text.

Pete.S. · Mar 3, 2016

Thats true, The block will display the last language which it was saved in.

That's the gotcha. You have to SAVE the block or it will always open the same way regardless if you change the language.

NOP in STL - Step7

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