Rockwell-automation FactoryTalk Historian SE 3.0 Live Data Interface U Uživatelský manuál stáhnout pdf (Strana 29)

5 ● Point Configuration

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InstrumentTag

InstrumentTag contains the ItemID of the tag. The format of this field

depends on the FactoryTalk Live Data server:

Type of the tag

InstrumentTag syntax

Device tags

<application name>/<area name>:<data server name>:[<shortcut

name>]<tag name>

HMI tags

<application name>/<area name>:<HMI server Name>:<folder

name>\<tag name>

The field must match the point defined on the FactoryTalk Live Data

server, including punctuation, spaces, and case.

Length

InstrumentTag field allows a maximum of 1023 characters.

The FTLD interface gets the $Global scope from the /FTDirectory

parameter and / from the /FTContext parameter. For additional information

on these parameters, see Command-line Parameters (page 37).

ExDesc

The ExDesc (Extended Descriptor) is a string attribute. Typically, this

attribute is used to implement Trigger Input points.

For example: If a PI point has the ExDesc attribute "EVENT='Tag1'

Anychange," it means trigger on any change as long as the Tag1 value of

the current event is different from the value of the previous event.

Length

The ExDesc field allows a maximum of 1023 characters.

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Rockwell-automation FactoryTalk Historian SE 3.0 Live Data Interface U Uživatelský manuál Strana 29