描述
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，如接触器、电磁阀、指示灯等执行元件组成。电器控制系统是根据操作指令及被控对象发出的信号，由控制电路按规定的动作要求决定执行什么动作或动作的顺序，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。
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