Explain FB,FC,DB AND OB

HI ALL!!!

CAN SOMEBODY EXPLAIN ME THE APPLICATION OF FB,FC,DB AND OB IN A SIMPLE FASHION? i.e WHAT DO THEY DO? WHAT FOR? etc.

YOURS FAITHFULLY,

NEWBIE

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Split from Using PCS7 APL blocks in s7 and wincc project.

Hello Newbie19,

in a very short version:

OB - Organisation block
This blocks are for different tasks, programm organisation, hardware faults, software faults, cyclic interrupt and a lot more. You need evreytime OB1 as Main OB for the program organisation.

FB - Function block
This blocks are for logial connections between signals and variables. You need a instance DB, where you can storage internal variables as static 

FC - Function
This block type is the same like FB only without the instance DB. You have only local variables

DB - Data block
This block is for storing variables.

I would suggest that you buy a book from Hans Berger - Automation with Simatic.
He write a lot of books about the Siemens SImatic and is a axcellent author.
You must only know what do you want to do for a programming language and what for PLC you want to use.

In my opinion is this the best way to answer the most of your questions, 

I hope this help a little bit.

regard
CaOd

Newbie19

 FB,FC,DB AND OB IN A SIMPLE FASHION

LINK: VIDEO 

New question published by ihsei908 is split to a separate thread with the subject Help needed with STL code.

Best regards
Jen_Moderator