现手头没有CP341模板的说明书，楼主自己可查一查。
楼主没有讲CP341模板的指示灯是什么状态，先看一看指示灯。
The group error display SF always lights up after mains-on and goes out after initialization is complete. If parameter assignment data were created for the CP 341, the SF LED lights up again briefly when new parameters are assigned.
The group error display SF lights up, when the following errors have occurred:
• Hardware error
• Firmware error
• Parameter assignment error
• BREAK (Receiving line between CP 341 and communication partner is
interrupted.)