USB-7855R输入模块
USB-7855R输入模块



抽像一点讲，过程控制渗透在生活的各个角落。特别是在数控行业，尤为明显。早期在PLC时代，几乎是一统天下。当大小不一的控制卡公司如雨后春笋般成长起来时，控制卡在过程控制逐步体现出强劲优势。 其编程手段往往邦定非常成熟的编程工具，如：CB,VC,Dephi,CB。故其推广非常迅速. 很快拥有大量客户群。 但是，作为编程者，碰到同一程序需要控制多个同样设备时（动作不一定同步），往往在Window多任务系统的影响下，很快想到多线程技术，其实多线程编程对系统依赖性较强，不同级别的处理，将导致程序的维护成本增加，并且还需要考虑线程之间的通讯，使编程起来较为麻烦。事实上，依靠过程编程的思想，会使程序获得更简单的做法。
纯粹从编程角度来看，过程控制编程应包含几个要素，下面以C++伪码方式来表示一个类，较易说明问题：
注意：有很多程序员在不同编译器下，需要不同的OnRunAction函数版本，以上实现最为简单，但有一些较特殊。比如：在程序启动时，就驱动所有设备，这点本人在VC6.0环境有过经验，可以分享一下，其它环境下，还需同胞们一起去努力发现。
还有一点声明，多线程技术也不是一无是处，在花费时间较频繁的通讯编程方面，它的优势，还是有相当的力。

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