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概述各行各业中大量使用着继电器控制线路,其功能要求可分解为按次序的一系列操作,而每一步操作必须满足一定的工艺条件和时间条件。当然,每一步可能要操作不同组合的若干个输出执行部件;再者,也许每个输出执行部件的动作还受到另外一些工艺和时间条件限制或保护等等。设计出一种所谓“步进链”,使得任何时间内只出现一步的操作,每一步严格按设计顺序进行,这就是命名顺序控制器的由来。由于每次只走一步,而且只
Overview In all walks of life extensive use of relay control circuit, the functional requirements can be decomposed into a series of operations in accordance with the order, and each step of the operation must meet certain conditions and time conditions. Of course, each step may need to operate a number of different combinations of the output of the implementation of components; Furthermore, perhaps each of the output of the implementation of the components of the action is subject to some other process and time constraints or protection and so on. Designed a so-called “stepping chain” so that only one step at any time in the operation, each step in strict accordance with the design order, this is the name of the order controller. Because only one step at a time, and only