RSView Supervisory Edition Installation Guide

7 • SETTING UP COMMUNICATIONS• • • • •Using multiple data serversIn RSView Studio, you can add more than one data server to an RSView SupervisoryEdition application. A single RSView application can contain up to 25 data servers.Use multiple data servers to:• balance the processing load for exchanging data. If CPU usage is high on a computeron which one data server is running, you should create another data server on anothercomputer to balance the processing load.• provide data-access redundancy. This is available for distributed applications only.To provide redundancy, set up a secondary data server on another computer. On theprimary data server, change the settings in the Redundancy tab of the Data ServerProperties dialog box, to switch clients to the secondary server if the primary one fails.• communicate with more than one type of controller simultaneously, for example aRockwell Automation controller (such as ControlLogix), a Modicon controller, and aSiemens controller.7 • PlaceholderBoth RSLinx Classic and RSLinx Enterprise can be set up to communicate with multipletypes of controllers simultaneously. This means you might not need a separate data serverfor each controller.Communicating with multiple controllersYou can set up one data server, or several, to communicate with multiple controllers.If you have set up RSLinx to communicate with all the controllers in an application, youonly need one data server that you set up with an OPC topic or device shortcut for eachcontroller.If you have set up multiple remote copies of RSLinx, each of which communicates with adifferent controller or network, you will need to set up a data server for each remote copyof RSLinx you have running.For details about setting up communications:• in RSLinx Enterprise, add an RSLinx Enterprise data server to an application, openthe Communications Setup editor, and then click Help.• in RSLinx Classic, see Getting Results with RSLinx, or see Help for RSLinx Classic.RSLinx Enterprise is optimized to provide best performance for large numbers of clients (morethan 10), and large numbers of tags (more than 10,000), even when it is on the same computeras the HMI server.If an application requires more than 10,000 tags and is not using RSLinx Enterprise, place theOPC data server on its own, dedicated host computer for best performance.7-3