The goal of time synchronization is to maintain accurate time across all components within the Metasys system. In general, the Site Director is responsible for requesting time from an external time server, and the Site Director’s child devices request the time from the Site Director. Requests for time are done using Network Time Protocol (NTP) requests. Network-wide time management ensures that scheduling, trending, audit trailing, data collecting, time-stamping of alarms, and other functions that require accurate time management use the correct time zone, date, and time consistently for all system operations.
The following table summarizes the time sources for various system items. All time is in UTC and all system devices adjust to daylight savings time.
|
Item |
Time Source |
|---|---|
|
Trend Data, Events, and Commands |
Network Engine |
|
Annotations |
Metasys Server 1 |
|
Event Acknowledgements |
Metasys Server1 |
To ensure that the correct time appears on the Site Management Portal user interface accessed from a client computer, apply the most recent Daylight Saving Time (DST) patch for the operating system on all clients that access the Site Director. The latest DST patch is available from the Microsoft Download center.