Prompt that version v8.2 is instilled onyour computer, this setup cannot instill version v2.0 on top of it. . . The computer is equipped with Siemens software. After plugging in the USB cable, the SIMATIC PC Adapter USB in the device manager still displays a yellow question mark, which cannot be safe. What is the reason?
The reason for the USB adapter driver, now the STEP7 5.5 version software has its own USB communication adapter driver, but it can only be used for the original USB communication adapter of Siemens. Those cottage USB communication adapters will appear in your situation. The solution is to change the STEP7 software with a slightly lower version, such as STEP7 5.4, or manually delete the USB driver file that comes with Siemens, and then manually install the driver that comes with your USB communication adapter.
PLC Cable 