2/1/2017 8:43 AM | |
Joined: 7/9/2015 Last visit: 10/9/2024 Posts: 3966 Rating: (591) |
Hi @success, please check the following manual - I think it would be very suitable for you: SIMATIC Working with STEP 7 V5.5Regards, Towome |
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2/1/2017 7:53 PM | |
Joined: 12/9/2010 Last visit: 10/8/2022 Posts: 623 Rating: (77) |
Hi @success, As a beginner, u should only work with OB1. OB stands for organization block. It contains and also organizes various program sections, subroutines(called as FC/FB in siemens). FC/FB is part of program and definately u need to call it in OB for its execution. Necessarily not in OB1 but u should call it in any one of OBs available. OBs by definition is interface between CPU OS and user program. In simple words, the CPU OS selects which OB to execute and executes program written in OBs only. OB1- This OB is called cyclically again by OS after it finishes its execution. So all plant logic should be included here. U can divide entire logic in smaller sections with the help of FC/FB(subroutines) OB30-38- These are called after definite time as declared in HW configuration. Error OBs- These are called if there is programming error or hardware malfunction etc. |
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