User Guide User Manual

FactoryTalk Historian To Historian Interface User Guide 41

Location2

Location2 specifies data timestamp adjustment. The source Historian Server supplies a

timestamp for each data event. Users have the option of adjusting these timestamps to

account for time differences between Historian Servers. It is required that each Historian

Server have the correct system time for its configured time zone. See section Data

Timestamps for a complete discussion.

Location2

Value

Adjust for Time

Zone

Differences

Do Not Adjust for

Time Zone

Differences*

Adjust for

Clock Drift**

Truncate Sub-Second

Timestamps***

Yes

* Only available if source and/or receiving Historian Server is a PI2 system.

** Receiving Historian Server is the time master. Timestamps are adjusted to receiving Historian

Server time. An offset of 30 minutes or less is considered clock drift.

***Truncating sub-second timestamps can lead to data loss during history recovery and archive data

scanning if multiple events are stored within the same second. Use with caution.

Location3

Location3 is used to configure what interface status events are written to a tag.

„IO Timeout‟ status events will result in a data gap for periods of Historian Server

disconnection. See section Interface Status Events for a complete discussion.

If a tag is configured for archive data collection, this attribute also specifies whether or not

the snapshot value is included with each scan update.

Location3

Value

Write

“I/O Timeout”

Write

“Access Denied”

Include

Snapshot

Point Level

Debugging

Yes