![]() By using an OPC server the information coming to both systems will match and hence the systems will remain in sync. In redundant mode both servers in a server pair are polling the information independently from the controllers. The reliance on the OPC server is required to enable WinCC to operate in redundant mode without putting excessive load on the controllers. This reliance on OPC makes the job of the Siemens development team easier but the task of integrating systems with multiple vendors more complex as all communication paths pass from WinCC to the OPC server and then to the device. This focus can be showen as new versions are progressively removing support for direct drivers to other PLC vendors and replacing this with a reliance on OPC. ![]() The WinCC system is focused on the Siemens PLC market. Hallo, ich habe da einen vergleich zwischen WinCC und Vijeo Citect.
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