From OpenSCADAWiki
The discrete complex parameter of the object-tag ModBus.CM101.CB102, presented by us in the form of a ball valve, is active. That is, it can be selected, than having the control panel on the right (Fig.5.2.6), as well as send commands (open or close). You can transfer the commands from the control panel or through the context menu. All actions of the operator from the control influence are logged and the protocol document can be viewed at selection the view "Document" (Fig.5.2.8).