Rockwell-automation FactoryTalk Historian SE DataLink 4.2 User Guide Instrukcja Użytkownika Pobierz pdf (Strona 96)

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FactoryTalk Historian DataLink User Guide

When using FactoryTalk Historian times, follow these guidelines:

 Use absolute or combined time expressions. Avoid using relative time

expressions. Multiple relative time expressions in a time range may

cause an incorrect start time or an error message, depending on the

context of the expression.

 Relative and combined time expressions contain only a single

operator: either a single plus sign (+) or a single minus sign (-).

Additional operators can lead to unpredictable results. For example,

the following are not valid time expressions:

*+1d+4h

T-1d+12h

 The name or short name for an interval used to denote FactoryTalk

Historian time is not case-sensitive.

FactoryTalk Historian Time String Examples

Time Syntax Examples

PI Time String

Meaning

06-dec-91 15:00:00

3:00:00 pm on December 6, 1991

Current time (now)

00:00:00 (midnight) on the 25th of the

current month

25-aug-92

00:00:00 (midnight) on August 25th, 1992

08:00:00 on the current date

25 8:

08:00:00 on the 25th of the current month

00:00:00 on the current date (today)

00:00:00 on the previous date (yesterday)

sun, mon, tue, wed, thu, fri, sat

00:00:00 on the most recent Sunday,

Monday, ... Saturday

1 2 ... 91 92 93 94 95 96 97 98 99 100 101 ... 163 164

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Rockwell-automation FactoryTalk Historian SE DataLink 4.2 User Guide Instrukcja Użytkownika Strona 96