Study of PLC Communication Technology Based on Profibus-DP

his paper provides a method for the communication between PLC and IPC using Profibus-DP bus. It introduces the setting steps on the software Simatic and Labview. Using EM277, S7-200 can communicate with S7-300.And based on OPC technology, Labview can send and receive control message to S7-300.Profibus-DP bus can quickly delivers control digitals from Labview to S7-200.And this system is used in some space project, and have good results.