Siemens 6AV6651-7KA01-3AA4 - S7-1200 + KTP400 Basic Starter Kit 6AV6651-7KA01-3AA4 사용자 설명서

Programming made easy 

 

6.1 Easy to design your user program 

 

Easy Book 

88

 

Manual, 03/2014, A5E02486774-AF 

 

 

A 

Calling block (or interrupted block) 

B 

Called FB or BC (or interrupting OB) 

①

  Program execution 

②

  Instruction (or interrupting event) that initiates 

the execution of another block 

③

  Program execution 

④

  Block end (returns to calling block) 

You can nest the block calls for a more modular structure. In the following example, the 

nesting depth is 3: the program cycle OB plus 3 layers of calls to code blocks. 

 

 

①

  Start of cycle 

②

  Nesting depth 

 

 

By creating generic code blocks that can be reused within the user program, you can simplify 

the design and implementation of the user program.  
●  You can create reusable blocks of code for standard tasks, such as for controlling a pump 

or a motor. You can also store these generic code blocks in a library that can be used by 

different applications or solutions. 

●  When you structure the user program into modular components that relate to functional 

tasks, the design of your program can be easier to understand and to manage. The 

modular components not only help to standardize the program design but can also help 

to make updating or modifying the program code quicker and easier. 

●  Creating modular components simplifies the debugging of your program. By structuring 

the complete program as a set of modular program segments, you can test the 

functionality of each code block as it is developed. 

●  Utilizing a modular design that relates to specific functional tasks can reduce the time 

required for the commissioning of the completed application.