对原驾驶室设计缺陷进行分析后，提出了加装防撞装置的方案，并对驾驶室PLC逻辑控制程序进行了改造。提高了卸船机驾驶室的安全性。
This paper puts forward the plan of installing the anti-collision device, and reform the PLC logic control program of cab, which enhances the safety of the cab of the ship unloader.
逻辑分析仪用以侦测usb装置的存取状态，并于侦测到usb装置的存取操作发生错误时于驱动信号上产生脉冲。
The logic analyzer detects the storage state of the USB device and generates pulse on a drive signal when the storage operation of the USB device is error.
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