高速无菌牛奶砖包机上下位机通讯设计

为了解决高速无菌牛奶砖包机在设计中出现的通讯问题,并考虑对操作员操作及对砖包机维护的需要,使用工控机作为上位机,采用GE90系列PLC作为下位机,上位机对PLC内部底层通讯协议SNP进行封装,使用多寄存器寻址方式,实现了在一个采样周期内完成对一台下位机的多类型寄存器的数据采集,阐述了实现高速数据采集实现原理,并结合寄存器修改方式,实现了上位机对下位机PLC输入端口的“虚拟输入”,在此基础上,编写了上位机对下位机的监视及控制程序,并建立了基于网络的远程故障诊断及维护系统。

Communication design for high speed aseptic brick filling machine

For solving the communication problem of high speed aseptic brick filling machine,and meanwhile for the need of establishing the Operator System Program and Intelligent Maintain System.One industrial-control computer is taken as upper machine,and GE90 series PLC is taken as lower machine.With the method of half-duplex master-slave data polling and encapsulating the SNP protocol,GE PLC's internal communication protocol,the upper machine can achieve the function of acquiring all datum in one time from one PLC,and the upper machine can also achieve the function of "virtual input" via communication cable,which is the foundation of establishing the Operator System Program and Intelligent Maintain System.