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。
This paper introduces the basic concepts of states, State Procedure and Step Ladder Instruction and its application method in designing VMGC100 electric system.
本文介绍了一种标识流图在顺序控制系统中建模方法，然后利用可编程序控制器中的步进指令实现控制。
The paper introduces a method of establishing model using mark flow graph in sequence control system. Then the control is implemented by step-by-step instruments in 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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