Rockwell-automation FactoryTalk Historian SE ActiveView 3.2 User Guide Uživatelský manuál stáhnout pdf (Strana 30)

100

101

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FactoryTalk Historian ActiveView User Guide

Constant

Result

Sunday or sun

00:00:00 (midnight) on the most recent past Sunday (in reference to the

Historian Server).

FactoryTalk Historian Time Expressions

FactoryTalk Historian allows three types of time expressions: relative time,

combined time, and absolute time. These time expression types are defined

in the following table.

Expression

Description

Examples

Relative Time

Relative time expressions specify a number of days, hours,

minutes, or seconds with either a leading plus sign or a

leading minus sign.

The reference time, or starting time, for the relative time

expression is the current time if both start and end times are

relative.

+1d

-24h

-3m

+24s

Combined

Time

A combined time expression is a specific reference time

followed by a relative time expression.

*+8h

18-dec-02 -

t+32s

Absolute Time

An absolute time expression is any time expression that is

neither a relative nor a combined time expression.

14-Dec-97

11-Nov-96

2:00:00.0001

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.

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