我们公司新上了两台840D的数控轧辊磨床,厂家给了S7-300的PLC程序,我安装完STEP7后在我打开工程时,跳出一个窗口说:software package missage,是工程里面的sinumerik 810D/840D,然后如果我要看硬件组态,就会跳出一个窗口说:the project contains objects of the software package 'sinumerik 810d/840d,whick can not be edited because the software package is not installed or existst in an earlier version,这个软件包是怎么一回事儿呢??请大家帮帮忙啊,非常感谢