IC693ACC302
IC693ACC302
IC693ACC302
IC693ACC302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,特别是各部分相互联系很少,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。
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