How does Siemens PLC communicate with the host computer via the Internet?
You can use Siemens WINCC software or third-party tools like GE's iFIX to set up an OPC server and establish communication with a PLC using the SIMATIC NET PC software.
Configuration of Communication Between OPC Server and PLC S7
1) Configure the hardware rack of the PC station: Once SIMATIC NET is installed, open the Station Configurator from the desktop shortcut or taskbar icon. In the configuration window, select slot 1 and click "Add." Choose "OPC Server" from the components list and confirm. Then, go to slot 3, click "Add," and select "IE General." Double-click on IE General to access its properties and configure network settings. Finally, click "Station Name," enter a name for your PC station, and confirm to complete the hardware setup.
2) Configuration and use of the Configuration Console: Open the Configuration Console by navigating to Start > SIMATIC > SIMATIC NET > Configuration Console. This tool is essential for setting up and diagnosing both hardware and application configurations. After completing the PC station’s hardware configuration, you should see the IE General mode change from PG mode to Configured mode, with the slot number (Index) automatically set to 3. In the Access Points Settings window, double-click "S7ONLINE" and set it to "PC internal (local)" to prepare for downloading the PC station configuration.
3) Configuring the PC Station in SIMATIC NET: Continue with the configuration process by selecting the appropriate modules and defining the communication parameters between the OPC server and the PLC. Ensure all connections are properly defined and that the IP addresses match the network setup.
4) Configuration Download: Once the setup is complete, download the configuration to the PC station using the SIMATIC NET software. This step ensures that all settings are applied and that the system is ready for data exchange.
5) Data Communication Test: Use the OPC Scout tool to test the communication between the OPC server and the PLC. This tool allows you to monitor and verify real-time data exchange, ensuring that the connection is working correctly and that data is being transferred as expected.
By following these steps, you can successfully establish a reliable communication link between the OPC server and the PLC using SIMATIC NET, allowing for efficient data exchange and system monitoring.
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