Rockwell Automation FactoryTalk Alarms and Events Quick Start - Manual (Page 220)

FactoryTalk Alarms and Events System Configuration Guide
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2. In the Browse for Folder dialog box, select the new folder for the log files, and
then click OK. To create a new folder for the log file, click Make New Folder.
Time stamps with tag-based alarms
If your FactoryTalk Alarms and Events system includes tag-based alarm servers, the
time stamps for those alarms come from the computer that is hosting the server that is
providing tags to the alarm server (for example, RSLinx Enterprise or a third-party
Data Server). To ensure that alarms are ordered properly by time, you must
synchronize the computer’s clock with the controllers’ clocks.
The simplest way to solve this synchronization problem is to run the Logix5000 Clock
Update Tool on the same computer as the RSLinx Enterprise alarm server. This
ensures that the controller clocks all synchronize with the computer’s tag-based alarm
server. Typical systems using this method commonly achieve 300ms synchronization.
If it is not possible to install the Logix5000 Clock Update Tool on the same computer
that is hosting the data server that is providing tags for the tag-based alarm server, try
to synchronize the computer’s clock with the same NTP server that is used to
synchronize the control network, with similar network latencies.
For details about tag-based alarms, see Chapter 6, “Add a tag-based alarm server for
Logix5000, PLC-5, SLC 500, or third-party controllers”.