Sequential control design method is an advanced (regular) design method for design of PLC ladder diagram, and it is a powerful tool.
顺序控制设计法是设计PLC梯形图的一种先进规范的方法和有力工具。
PLC programming technique includes experience design method, logic design method, cycle diagram design method and sequential control design method.
PLC编程技术包括：经验设计法，逻辑设计法、时序图设计法、顺序控制设计法等编程方法。
The way of data transfer in DMA mode, control method of logical programmable device and design of driver program are discussed to solve the key point of sequential transmission.
给出DMA工作方式下数据传输的设计方法，可编程逻辑器件的控制逻辑和驱动程序设计，解决了数据传输连续性的关键问题。
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