考虑到继电器控制装置各类触点的动作时间一般在 100ms 以上,而 PLC 扫描用户程序的时间一般均小于100ms,因此,PLC 采用了一种不同于一般微型计算机的运行方式—扫描技术。这样在对于 I/O 响应要求不高的场合,PLC 与继电器控制装置的处理结果上就没有什么区别了。
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