A bit more S7 STL to LAD help needed please?

uptown47

Lifetime Supporting Member
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Join Date
Feb 2008
Location
Over there, next to those boxes
Posts
1,146
Hi
I wondered if anyone could help translate the following two networks into Lad as they don't directly translate. I've had a go myself but need someone just to check whether I'm right or not.
Code: 
A M 134.4
AN T19
O M135.1
AN M136.7
= M155.0
  M134.4  T19            M155.0
---| |----|/|-------------()
                |
  M135.1 M136.7 |
---| |----|/|---
And the next one is....
Code: 
A M134.6
A T19
AN M135.1
O M137.2
O M134.4
AN M136.7
= M143.0
 M134.6  T19     M135.1    M143.0
---| |----| |----|/|--------()
                     |
                     |
  M137.2             |
---| |----------------
                     |
                     |
 M134.4  M136.7      |
---| |----|/|---------

Thanks for any help you can give me with this.
Cheers
;-)
 
Code: 
IF M 134.4
AND NOT T19
= RLO
IF RLO
OR M135.1
= RLO
IF RLO
AND NOT M136.7
= M155.0



AND M134.6
AND T19
AND NOT M135.1
= RLO
IF RLO
OR M137.2
OR M134.4
= RLO
IF RLO
AND NOT M136.7
= M143.0


RLO = result of logic operation.
Use the time now to learn simple conversions like that, it will save time in future.
 
Hi TurpoUrpo,

Thanks for your help (again). I want to learn this but I struggle to get my head around it.

Your explanation is excellent though.

Can I just clarify that you are saying my attempt at translating the first one is correct but the second one should be:

Code: 
 M134.6  T19     M135.1    M143.0
---| |----| |----|/|--------()
                     |
                     |
  M137.2    M136.7   |
---| |------|/|------
         |
         |
 M134.4  |     
---| |----

Is that right?

Many thanks for your continued help (and patience!!)

;-)
 
No, both are wrong, you miss that last "and" is with all of code that was before it. I tried to make it more clear by showing the intermediate rlo.
 
Last edited:
So is this correct:
Code: 
IF M 134.4
AND NOT T19
= RLO
IF RLO
OR M135.1
= RLO
IF RLO
AND NOT M136.7
= M155.0

  M134.4  T19      M136.7   M155.0
---| |----|/|-------|/|------()
                |
  M135.1        |
---| |----------
 
AND M134.6
AND T19
AND NOT M135.1
= RLO
IF RLO
OR M137.2
OR M134.4
= RLO
IF RLO
AND NOT M136.7
= M143.0

 M134.6  T19     M135.1  M136.7 M143.0
---| |----| |----|/|-----|/|----()
                     |
                     |
  M137.2             |
---| |---------------
         |
         |
 M134.4  |     
---| |----
???
If it is correct then I would never have got that. How do you know that the last AND (AND NOT M136.7) statement relates to all of the previous instructions and not just to the 2 OR instructions (OR M137.2 / OR M134.4) ??
Thanks again for your continued help
Cheers
;-)
 
a good way to do this and learn the conversion is to write the code you think in a new network, then change the view to STL and see what you have.
 
Hi Peter,

Thanks for your reply. I did try this but the code translates differently to the STL I have got. Although this is hardly surprising as, I would assume, if it translated to exactly the same as my original STL then my original STL would translate to Ladder ;-))

I would really like to get my head around this though so I can translate confidently in the future.

Thank you

;-)
 
Here's one for you to translate:

Code: 
      A     I      0.0
      A(    
      O     I      0.1
      ON    I      0.2
      )     
      A     I      0.3
      O     
      A     I      0.4
      A(    
      A     I      0.5
      A(    
      O     I      0.6
      ON    I      0.7
      )     
      BLD   8
      O     
      A     I      1.0
      A(    
      A     I      1.1
      A     I      1.2
      O     
      AN    I      1.3
      AN    I      1.4
      )     
      BLD   8
      A(    
      O     I      1.5
      ON    I      1.6
      )     
      )     
      =     Q      0.0
 
L D[AR2 said:
Here's one for you to translate:

Code: 
      A     I      0.0
      A(    
      O     I      0.1
      ON    I      0.2
      )     
      A     I      0.3
      O     
      A     I      0.4
      A(    
      A     I      0.5
      A(    
      O     I      0.6
      ON    I      0.7
      )     
      BLD   8
      O     
      A     I      1.0
      A(    
      A     I      1.1
      A     I      1.2
      O     
      AN    I      1.3
      AN    I      1.4
      )     
      BLD   8
      A(    
      O     I      1.5
      ON    I      1.6
      )     
      )     
      =     Q      0.0
Click to expand...

Ha Ha... will give it a go!

In the meantime, are my corrected translations in a couple of posts above right?

Also, can someone answer why the last AND (AND NOT M136.7) statement relates to all of the previous instructions and not just to the 2 OR instructions (OR M137.2 / OR M134.4) in the example in that post.

(will post back an attempt at this translation...)

Cheers

;-)
 
What about this....?

Code: 
    A     I      0.0
      A(    
      O     I      0.1
      ON    I      0.2
      )     
      A     I      0.3
      O     
      A     I      0.4
      A(    
      A     I      0.5
      A(    
      O     I      0.6
      ON    I      0.7
      )     
      BLD   8
      O     
      A     I      1.0
      A(    
      A     I      1.1
      A     I      1.2
      O     
      AN    I      1.3
      AN    I      1.4
      )     
      BLD   8
      A(    
      O     I      1.5
      ON    I      1.6
      )     
      )     
      =     Q      0.0

See attached screenshot (couldn't be bothered trying to type it all in in Notepad!)

Am I right??

Cheers

;-)

PS... Just typed the STL into S7 to try and convert it to see if I was right but it won't convert.... (presume you did that to stop me cheating!) ;-)

Image1.jpg
 
Last edited:
uptown47 said:
Ha Ha... will give it a go!

In the meantime, are my corrected translations in a couple of posts above right?

Also, can someone answer why the last AND (AND NOT M136.7) statement relates to all of the previous instructions and not just to the 2 OR instructions (OR M137.2 / OR M134.4) in the example in that post.

(will post back an attempt at this translation...)

Cheers

;-)
Click to expand...

It relates to RLO at that point. Look for S7 help to find what statusword is and what those bits mean.
 
TurpoUrpo said:
It relates to RLO at that point. Look for S7 help to find what statusword is and what those bits mean.
Click to expand...

So after reading about the RLO is this correct...

Code: 
A M134.6
A T19
AN M135.1
O M137.2
O M134.4
AN M136.7
= M143.0
 
 
AND M134.6
AND T19
AND NOT M135.1
= RLO
IF RLO
OR M137.2
OR M134.4
= RLO
IF RLO
AND NOT M136.7
= M143.0

 M134.6  T19     M135.1  M137.2 M136.7 M143.0
---| |----| |----|/|-----| |-----|/|----()
                     |         |
                     |         |
                     |  M134.4 |
                     -----| |---

Thanks again for your continued help

;-)
 
uptown47 said:
So is this correct:
Code: 
IF M 134.4
AND NOT T19
= RLO
IF RLO
OR M135.1
= RLO
IF RLO
AND NOT M136.7
= M155.0

  M134.4  T19      M136.7   M155.0
---| |----|/|-------|/|------()
                |
  M135.1        |
---| |----------
 
AND M134.6
AND T19
AND NOT M135.1
= RLO
IF RLO
OR M137.2
OR M134.4
= RLO
IF RLO
AND NOT M136.7
= M143.0

 M134.6  T19     M135.1  M136.7 M143.0
---| |----| |----|/|-----|/|----()
                     |
                     |
  M137.2             |
---| |---------------
         |
         |
 M134.4  |     
---| |----
Click to expand...

These are correct.
 
uptown47 said:
PS... Just typed the STL into S7 to try and convert it to see if I was right but it won't convert.... (presume you did that to stop me cheating!) ;-)
Click to expand...

Correct, but please don't say you typed it in - hopefully you highlighted the code, copied (control+C) and then pasted it (Control+V) into a blank S7 network (viewed in STL):unsure:

(Delete the two lines of code BLD 8 and the STL will convert to ladder)
 
Last edited:
uptown47 said:
So after reading about the RLO is this correct...

Code: 
A M134.6
A T19
AN M135.1
O M137.2
O M134.4
AN M136.7
= M143.0
 
IF M134.6
= RLO
IF RLO
AND T19
= RLO
IF RLO
AND NOT M135.1
= RLO
IF RLO
OR M137.2
= RLO
IF RLO
OR M134.4
= RLO
IF RLO
AND NOT M136.7
= RLO
IF RLO
= M143.0
Click to expand...
 

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