【IC697MDL254】【IC697MDL254】

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1．是否采用PLC
　　设计一个控制系统，首先应该考虑的是：是否采用PLC。考虑的原则除控制功能外，主要是经济性和可靠性。如果被控制系统很简单，I/O点数很少，或者I/O点数虽多、但控制不复杂，特别是各部分相互很少，那就没有必要采用PLC。下列情况可考虑采用PLC：
　　1）I/O点数多，控制复杂。若用继电器控制需大量的中间继电器、时间继电器、计数器等。
　　2）对可靠性要求特别高，用继电器控制不能满足。
　　3）生产需要经常改变控制程序和修改控制参数。
　　4）可以用一台PLC控制多台设备。

：张亮（工程师）    专线：
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