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In order to solve the problem of insufficient control of CNC grinder workshop, a SCADA system based on SIMATIC NET for CNC grinder workshop is proposed, which is based on SIMATIC NET industrial Ethernet. The data exchange between SIMATIC NET OPC server and S7 series PLC in Siemens NC system is realized, and then the data is supplied to SIMATIC NET OPC client by using the communication module provided by SIMATIC NET. In the SCADA system of CNC grinder workshop, WinCC is used as the client of SIMATIC NET OPC, and the SIMATIC NET OPC client based on VB language is developed to increase the function of SCADA system. The SCADA system based on SIMATIC NET realizes the data acquisition and equipment monitoring of the NC workshop, which lays a foundation for the next stage of the information construction of the company.