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V700
下面通过一个电动机正反转的具体案例，举例说明plc系统开发的过程：PLC控制系统开发流程明确系统的控制要求系统要求通过3个按钮分别控制电动机的连续正转、反转和停转，用热继电器进行过载保护，要求正反转控制联锁。确定输入、输出设备，为其分配合适的IO端子输入输出设备对应的PLC端子绘制系统控制线路图PLC控制电机正、反转电路图编写PLC控制程序PLC梯形图程序将程序写入PLC在计算机中用编程软件编好程序后，如果要将程序写入PLC，须做以下工作。