step7启动进入编程界面时会提示如下信息: One or more objects or a tepy cannot be represented. Sever 's7fk35bx.dll'for _s7h_class_FM_POS_300_MPT_CT OBJECTS COULD NOT BE LOAD. Make sure the required software packages are installed. 点击'OK'后再次出现类似信息,数次后能够进行正常编程界面,请教高手是何原因?有无大碍?