What is OPC:
The full name of OPC is Object Linking and Embedding (OLE) for Process Control. Its appearance has established a bridge between Windows-based applications and field process control applications. In the past, in order to access the data information of field devices, every application software developer needed to write a dedicated interface function. Due to the wide variety of field equipment and the continuous upgrading of products, it often brings a huge workload to users and software developers. Usually this can not meet the actual needs of the work, system integrators and developers urgently need a plug-and-play device driver with high efficiency, reliability, openness, and interoperability. In this case, the OPC standard came into being. The OPC standard is based on Microsoft's OLE technology. Its formulation is accomplished by providing a set of standard OLE / COM interfaces. The OPC technology uses OLE 2 technology. The OLE standard allows multiple computers to exchange documents, Graphics and other objects. A simple understanding is that OPC is a software tool for protocol conversion. Its job is to convert different protocols into the communication protocols we need.
How to use OPC:
There are many OPCs that support WINCC. When connecting WINCC to Mitsubishi PLC, you need to use Mitsubishi OPC software. When communicating with Schneider, you need to use Schneider OPC software. S7-200 PC Access SMART is an OPC software developed by Siemens for use in connection with WINCC and S7-200SMART. It can convert the communication protocol of S7-200SMART into the communication protocol supported by WINCC, which in turn enables WINCC to communicate with S7- 200SMART communicates, and I will introduce to you how to use S7-200 PC Access SMART software.
