编写机器指令，测试、调试及集成程序。文件化整个系统及开发数据控制程序。
Write machine instructions, test, debug, and assemble program. Document overall system and develop data control procedures.
研究目的：通过对几个PLC控制程序的分析，使读者了解PLC程序的基本指令、控制方式和编程思想，初步掌握PLC的编程方法。
Research purposes: the purpose was to make readers to learn the basic instruction, control way, programming concept and programming method through the analysis of several control programmes of PLC.
通过比较，指出了S/R指令和步进指令在设计PLC顺序控制程序时所具有的不同特点。
The different characteristics between S/R instruction and Step Ladder instruction (STL) for designing sequential control program of PLC are putted forward passing through comparison.
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