Expect不只使用固定“脚本”作为应用程序的输入，而是使交互的每个击键都可编程。
Instead of just having a fixed "script" that you feed as input to an application, Expect makes every keystroke of the interaction programmable.
介绍了人们在实践中总结出的关于可编程序控制器的输入输出点数的扩展及节省的方法。
This article introduces the methods concluded from practice about the expanding and saving of data units of imput and output capability of PLC.
PLC可编程序控制器在应用中常遇到由于输入点不够而增加硬件设置的问题。
In application of PLC programmable controllers, it is ofter to meet with the problem to have to add hardware installations due to that the input points are not enough.
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