When users access any engine or server directly through a web browser, only the information local to that device is accessible. To make all information in the facility accessible from a single point, the Metasys system uses a Site Director. The Site Director is the device designated to maintain the site information, including the logical organization of data about your facility, user password administrative information, and overall master time and date. This function resides in an engine or, on large installations, a server. For networks that do not have a server, one of the engines is designated as the Site Director. When one or more servers are part of the network, one server must be designated as the Site Director. The Site Director provides a uniform point of entry and supports functions such as user login, user administration, time synchronization, and traffic management.
Consider a server as the Site Director if you require:
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support of multiple international languages
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repository for trend and alarm data and operator transactions, along with annotations for MVE systems
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a greater number of simultaneous users than an engine allows