Error in OB31

Dear experts,

My program S7 is the following 

/ // *** Error at line 3537 (OB 31): The program in the OB must be reformulated (eg using SFCs). ***

// // *** Error on line 3545 (OB 31): Command not defined. ***

my question is 

In this case what can I choose as SFC to cancel these errors  

and is the ASM a system error that can executed directly in the block S7?

thanks in advance.

Hello Hazem MH,

I think the command is missing or not correct but I cannot see the reason.

I recommend to make the block-consistency with your program. See in this case the FAQ for your support:

"How do you perform a block-consistency check following changes in the STEP 7 program?"
https://support.industry.siemens.com/cs/ww/en/view/5416540

I recommend also to use the function "Save as" together with the option "With Reorganization (slow)".

With best regards
Cicero