我用PC+CP5611板卡做上位机,连一个232转换模块,硬件测试通过,驱动等也装好了,用STEP7组态后,能够编译,但是程序下载的时候出现问题,显示:online:no connection established. no response from remote partner. 点击OK,出现提示:unable to establish connection to module station manager (index 125) in station SIMATIC PC Station(1)
请高手指点这是什么问题?该如何解决?