Rockwell-automation FactoryTalk Historian SE 3.0 Live Data Interface U Manual do Utilizador descarregar pdf (Página 34)

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FactoryTalk Historian Live Data Interface User Guide

Tag

InstrumentTag

Loc1

Loc2

Loc3

Loc4

Loc5

OneMin.PV

ItemID2

NinetyMin.PV

ItemID3

Advise Tags

For Advise tags, the interface asks the FTLD server to send data when it

changes, and how often it should read the device to see if there is a new

value.

For example:

Tag

InstrumentTag

Loc1

Loc2

Loc3

Loc4

Loc5

AdvFiveSecs.PV

ItemID1

AdvOneMin.PV

ItemID2

AdvNinetyMins.PV

ItemID3

Event Tags

Event tags are read when the triggering event occurs. An event happens

when the FactoryTalk Historian snapshot receives a value for the trigger

tag. It may have the same time stamp and quality and value as the last

event so the snapshot value for that trigger may seem the same, but the act

of receiving a value for the trigger tag causes the interface to receive a

notification that the trigger has been updated.

To configure triggered input tags, specify the name of the trigger tag in the

ExDesc field using the following format:

EVENT='triggertagname' event_condition

where triggertagname is enclosed in single quotes and, if specified,

the event_condition immediately follows the triggertagname.

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