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SIMATIC HMI WinCC V74 Mise en route

How does WinCC - SIMATIC net S7 OPC work?
In the following example, a WinCC - SIMATIC NET S7 OPC server is configured. Data from the automation device is made available to the WinCC client via the SIMATIC NET S7 OPC server. The current value of the tag is displayed in an I/O field on the WinCC OPC client.
What is the difference between HMI and WinCC?
HMI stands for "Human Machine Interface", i.e. the interface between the person and the machine. WinCC allows the operation and observance of the processes that run in a machine. The communication between WinCC and the machine takes place via an automation system. The creation of a sample project is described in Getting Started.
What is the system diagnostics of WinCC V7?
The system diagnostics of WinCC V7.4 displays faults and errors of the controllers "S7-1200" and "S7-1500". The WinCC SysDiagControl hereby provides an overview of fast error localization. A message view of the controller allows you to navigate directly to the control for the diagnostics overview with detailed information.
How do I install SIMATIC net drivers?
To install the SIMATIC NET drivers, use the latest SIMATIC NET DVD. The operating system must permit the installation of unsigned drivers and files. Detailed information is available in the section "Adapting Security Policies under Windows". An update of the operating system is not permitted if WinCC is started.

How does WinCC - SIMATIC net S7 OPC work?