SCL Language Help

I am beginner in SCL in TIA. Please help me with below clarifications .

1) How many lines of code supported by SCL and How many lines are recomemended by coding standard 

2) How to calculate cycle time for specified lines of instructions 

3) Is there any time out for case statement .

4) After 4 case statements , why monitor window not available ,even after respective case successful execution . Refer attached image 

5) How many cases can be written inside one case and recommended by coding standard

6) SCL_Monitor_Window_not_Available_Form_4th_Case_Statement

Thanks for your response .

I am using CPU 1516F-3 PN/DP ( 6ES7 516-3FN01-0AB0) . please help me

Stefan Arcularius

Hi Ravi_Mechatronics,

Two answers all your questions, we volunteers need more information. In particular, we need to know the PLC used, as there are differences in possible block sizes and also in performance (also in terms of monitoring).

Ravi_Mechatronics

2) How to calculate cycle time for specified lines of instructions

For CPUs of the S7-300/400 family you will find a manual with the necessary information. For CPUs of the S7-1200/1500 family you can only measure the time for an already created program.

Ravi_Mechatronics

3) Is there any time out for case statement .

The entire PLC stops when a configured maximum cycle time is exceeded.

Kind regards
Stefan

 Thanks for your response . I am using CPU 1516F-3 PN/DP (6ES7 516-3FN01-0AB0) 

4 . Case 60 was executed as like other cases 50,55 . Is it defect or something i am missing. This information ,  i am requesting to make my debugging easy instead of keeping in everything in watch table . Currently my code is having  365 lines 

      P.s : -  After 4 case statements in case , monitor window is not showing ,even after respective case successful execution as like first 4 case statements. 

6. Please ignore . it typo error 

0_Einstein

1. As much as necessary for your project, and no more!  If your PLC scan time is too low, the PLC is underpowered and should be upgraded to faster model.  Typically, all but the slowest S7-1500's are faster than the fastest S7-300's (at least, that is what Siemens told me when the S7-1500's hit the market, and may have changed over time, though doubtful). 
2. Use the RUNTIME instruction before and after logic you wish to measure execution time of.  F1-help on the usage of the RUNTIME instruction, plus there are several places to find additional support, like FAQ's featuring that instruction, Siemens library where they show how to use available PLC instructions.
3. _{Already answered by prior poster's reply}  
4. Unless the case variable is assigned the value 60 (in your posted example), the logic is not being solved, so it is not visible in the monitor window.  If you want to force the case variable to 60 so you can see it operate, you can do that with a force table (because your posted image's logic is in OB1).
5. As much as necessary for your project, and the default case (or CASE ELSE where the "exception" values are not met - if you want to think of it that way).
   
6. I do not understand what 6 means.

I recommend downloading and reading the S7-1200/S7-1500 programming and style guide found here: https://support.industry.siemens.com/cs/document/81318674

Ravi_Mechatronics

I am beginner in SCL in TIA. Please help me with below clarifications .

1) How many lines of code supported by SCL and How many lines are recomemended by coding standard 

2) How to calculate cycle time for specified lines of instructions 

3) Is there any time out for case statement .

4) After 4 case statements , why monitor window not available ,even after respective case successful execution . Refer attached image 

5) How many cases can be written inside one case and recommended by coding standard

6) SCL_Monitor_Window_not_Available_Form_4th_Case_Statement