The advantage function in PLC is stepping sequence control, the efficiency method of establishment the stepping sequence control program is drawing out the function diagram.
步进顺序控制是可编程序控制器的优势功能，编制步进顺序控制程序的有效方法是画出功能表图。
In this paper, Advanced Program Control of PLC is described in distribution system for Petro-Chemical industry.
文章介绍了采用PLC(可编程控制器)技术对石化工业配电系统进行先进的程序控制。
It detailed introduced composing of the PLC elevator control system, design of the hardware and soft, how to weave control program in graph of elevator for example.
以实例介绍了PLC电梯控制系统的组成、其硬件和软件的设计以及怎样用电梯图来编制系统的控制程序。
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