电器控制的组成
其中输入部分是由各种输入设备，如按钮、位置开关及传感器等组成；控制部分是按照控制要求设计的，由若干继电器及触点构成的具有一定逻辑功能的控制电路；输出部分是由各种输出设备，如器、电磁阀、指示灯等执行元件组成。电器控制是根据操作指令及被控对象发出的，由控制电路按规定的要求决定执行什么或的顺序，然后驱动输出设备去实现各种操作。由于控制电路是采用硬接线将各种继电器及触点按一定的要求连接而成，所以接线复杂且故障点多，同时不易灵活改变。
2. PLC控制的组成
由PLC构成的控制也是由输入、输出和控制三部分组成，如图2所示。
PLC控制的组成
从图中可以看出，PLC控制的输入、输出部分和电器控制的输入、输出部分基本相同，但控制部分是采用“可编程”的PLC，而不是实际的继电器线路。因此，PLC控制可以方便地通过改变用户程序，以实现各种控制功能，从根本上解决了电器控制控制电路难以改变的问题。同时，PLC控制不仅能实现逻辑运算，还具有数值运算及控制等复杂的控制功能。
【公 司】： 福建鸿飞达自动化科技有限公司
【主 营】： AB(罗克韦尔)PLC全系列、ABB机器人备件、施耐德140/TSX、西门子6SN/6FC、伺服全套等
【价 格】： 电议
【发布人】： 程先生
【电 话】： 15306977024 13625073704
【所在地】： 福建 - 福州
【坐 机】： 0591-83532940
【Q Q】： 2851617309
【传 真】： 0591-88263940
【邮 箱】： 2851617309@qq.com
产品价格以电话或者QQ询价为准，发布价格不做参考，图片也一样
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