Rockwell-automation FactoryTalk Historian SE DataLink 4.2 User Guide Uživatelský manuál stáhnout pdf (Strana 42)

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FactoryTalk Historian DataLink User Guide

Example:

To see the current value of the sinusoid tag, the following arguments are

set for the Current Value function:

Tagname = sinusoid

time at left

The resulting function array appears as:

Archive Value

Retrieves a FactoryTalk Historian point value, or evaluates an expression

corresponding to a specified time stamp.

Required

Arguments

Tagname or Expression

Timestamp

The time reference used to retrieve the archive value from

FactoryTalk Historian, which can be a fixed

time value

(page 21) or

expressed relative to the current time.

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Rockwell-automation FactoryTalk Historian SE DataLink 4.2 User Guide Uživatelský manuál Strana 42