展会行车是用三菱PLC控制自动移动的大型LED广告屏[2008深圳高交会上使用]，本代码实现广告屏主机与三菱PLC通讯。yhp1888@126.com-Show carriageway is Mitsubishi PLC control automatically the movement of large-scale LED advertising screen [2008 at the Shenzhen High-use], implementation of the code screen