RSView Supervisory Edition Installation Guide

• • • • •RSVIEW SUPERVISORY EDITION USER’S GUIDESyntaxPrecede area names with a forward slash (/). Also separate area names from other areanames, with a forward slash.Separate area names from component names with two colons (::)Example: Using the Display command with absolute and relativereferences in distributed applicationsAssume that a graphic display called Overview appears if the operator presses a button ona graphic display. To show the Overview display, use the Display command in the button’spress action, as follows:• To create an absolute reference to the display called Overview in the area calledBaking, type Display /Baking::Overview.• To create an absolute reference to the display called Overview in the area calledPackaging, type Display /Packaging::Overview.• To create an absolute reference to the display called Overview in the root area of theapplication, type Display /::Overview.• To create a relative reference to the display called Overview in the area from whichthe Display command is issued, type Display Overview.Use the Command Wizard to build commands that take application components as parameters.The Command Wizard supplies the correct syntax, based on the location of the component youselect.More information and examplesFor more information about using absolute and relative references:• with tags, see “Using tag references” on page 8-11.• with commands, see page A-5.RedundancyIn process monitoring and control automation, redundancy refers to the ability of thesystem running the process to continue to work correctly when one or more parts of thesystem become unavailable, or fail. You can enable redundancy by setting up pairs ofcritical systems components, such as data servers, on paired computers. One server in thepair acts as the primary server, and the other acts as the secondary, or backup, server.5-6