An on-site operating station can basically be accessed in two different ways.
Display and operation of screens via the Sm@rtClient concept
Within the scope of the Sm@rtClient concept, a station can make its screens accessible to another station. It then assumes the function of a Sm@rtServer, while the other station assumes that of the Sm@rtClient. The server function can be activated quite simply with a mouse-click when making the device settings. The screen can be displayed on the Sm@rtClient by means of a Sm@rtClient display in "View only" mode, but a full-fledged, coordinated operator console can be set up as well. "Coordinated operation" implies that at any one time only one station has the right of operation, i.e. either the operator station with Sm@rtServer function or that with the Sm@rtClient function. Depending on the basic hardware, a Sm@rtServer can supply up to five clients simultaneously with updated process pictures (for PCs; for panels it is a maximumof three clients). One channel should always be reserved for service purposes.
Distributed operator stations
The operation of large, physically distributed machines and plants becomes easier, because distributed operator stations can be configured by means of the Sm@rtClient concept, so that the operator can control and monitor from various locations - while only needing to configure one time. Changes to the configuration therefore only have to be performed once on the Sm@rtServer. The operator can see the same display on every operator station, although only one station can beoperated at any one time (coordinated operation).
Remote control via Internet Explorer
For remote operating and monitoring of SIMATIC Panels or WinCC Advanced RT, a standard browser, which gives the user direct access to the HMI device on-site via the standard HTML pages of the operating stations, is sufficient. If the Sm@rtViewer is used instead of a browser, it not only displays the selected screen, but also the layout of the on-site device, for example, the membrane front of a keypad device. With this tool, the HMI device can then be operated as if the user were on site, except that the keys are not really actuated, but operated by clicking the mouse.