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S7编程软件的使用方法(国外英文资料).doc

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S7编程软件的使用方法(国外英文资料) This article is contributed by wym_hn8139625 Powerpoint documents may be a poor experience at the WAP end. It is recommended that you choose TXT, or download the source file to the native view. Chapter 7 the use of programming software for the STEP7 programming software ? ? ? 7.7.7.7.7.7.7.7.7.7.7.7.7.7.7.7.7.4 user programs basic structure STEP7 programming software introduction programming software introduction hardware configuration using LAD programming Generally speaking, PLC has three programming methods, such as linear programming, modular programming and structured programming. ? Linear programming? Linear programming similar hardware relay control circuit, the system control program in the main loop control organization block OB1 (main program), every loop scanning to keep order in the line of OB1 all instructions. This method is simple in program structure, does not involve the use of function, the function block, block of data, such as local variables and in more complex concept, easy entry, commonly used in write simple control system program. This is what the book s7-200 focuses on. The modular programming program is divided into logical blocks, each containing the logical order to complete part of the control task. Decided to the instructions of tissue block OB1 (main program) in what circumstance with which a piece of cut, function and fast (a program) used to complete the process of different tasks. After the call block is executed, return to the call point of OB and continue with the OB1. The program for modular programming is divided into blocks that are easy to implement and program for a project. This improves the execution efficiency of the CPU because it executes the relevant instructions only when needed. 3, structured programming, structured programming complex automation tasks down into can reflect the process technology, the small tasks can or you can use repeatedly, these tasks represented by the corresponding program b
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