This paper introduces the basic concepts of states, State Procedure and Step Ladder Instruction and its application method in designing VMGC100 electric system.

介绍了状态元件，状态转移图和步进顺控指令的基本概念以及在VMGC100超精机电气系统设计中的应用方法。

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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.

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。

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