The realization of communication between the upper managing system and PLC by C^# programming

Introduced the dynamic link library function which published by PRODAVE software of Siemens,described the method of using C^# call for the dynamic link library function in PRODAVE software,and take the automatic system of Jiexiu Baoping coal preparation plant as an example,detailed introduced how to use C^# programming and realizing the communication in MPI mode between the upper control computer and Siemens S7-300 series PLC.