FreeSCADA is a Free SCADA system that comunicates with a PLC or any enabled Modbus TCP/IP device.
Once you have installed it you can type your ip address in your browser and login with the default admin user.
The web application enables you to add device tags to the system, create screens with assets to monitor and control tags on the PLC.
The web application comes installed with a demo so you can see how the application works. Default user name and password is 'admin'.
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