Advise tags, Event tags, E 28) – Rockwell Automation FactoryTalk Historian SE 3.0 Live Data Interface User Guide User Manual
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FactoryTalk Historian Live Data Interface User Guide
28
Tag
InstrumentTag Loc1 Loc2 Loc3 Loc4 Loc5
OneMin.PV
ItemID2
1
0
0
2
0
NinetyMin.PV
ItemID3
1
0
0
3
0
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
1
0
1
1
0
AdvOneMin.PV
ItemID2
1
0
1
2
0
AdvNinetyMins.PV ItemID3
1
0
1
3
0
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.