福州邮政局是福建省邮件进出口的中心枢纽，原有的转运、包裹推挂系统于1988年投入运行。随着国民经济和社会事业的迅猛发展，原系统容量和功能已远远不能满足生产需求，原有控制系统存在以下缺点。（1）可靠性差：原来的电控系统采用单片机为控制机，由于单片机的板件易受粉尘 Fuzhou Post Office is the center of Fujian Province, the import and export of mail hub, the original transit, parcel push system put into operation in 1988. With the rapid development of the national economy and social undertakings, the original system capacity and function have been far from meeting production needs. The original control system has the following disadvantages. (1) poor reliability: the original electronic control system using SCM as a control machine, the MCU board vulnerable to dust