用PLC替代老设备的继电器控制箱，使产品更新换代。给出了替代的一些步骤和方法。
Control case with the relay of PLC replacing old equipment, make produce renew, have given some replacing step and method.
复杂设备的电气控制箱正在被可编程控制器所代替。
The electric control box of complex equipment is being replaced by PLC.
本设备带有危险电压设备上电后在运行和操作时，不得打开电柜门和电器控制箱以免触电带来危险。
Equipment with dangerous electricity. When operation with electricity electric cabinet and control cabinet door cannot be open to avoid electricity danger.
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