Programme OB 100 et FC

Hello Ahmed;

If you are still not clear on the use of your code,the following discussion shows how to use similar code as you show in your question to set an Always_ON and an Always_OFF bit,, and discusses the use of Always_ON and Always_OFF bits in a Step 7 program:

https://support.industry.siemens.com/tf//ww/en/posts/always-on-or-off-bit/79179/?page=0&pageSize=10 helps,

Daniel Chartier