在电动机运行前，该保护系统对外部保护线路、PLC内部程序及PLC自身进行检查。
Before the operation of the motor, the system detects the external protective circuit, PLC and its internal program.
在电动机运行前，该保护系统对外部保护线路、PLC内部程序及PLC自身进行检查。
Before the operation of the motor, the system detects the external protective circuit, PLC and its internal program.
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