Rockwell Automation FactoryTalk Historian SE 3.0 Live Data Interface User Guide User Manual
Page 35
5
●
Point Configuration
●
●
●
●
●
29
If the event_condition is not specified then it defaults to
Anychange.
The update rate for event items groups is also related with the scan class,
so the server will be asked to update its cache once every scan period for
every event tag defined. That is probably faster or slower than necessary.
You must set the Loc4 attribute to make event tags work well. The
Location 5 attribute should have the value 1 for Event tags.
Typical example:
Tag
ExDesc
Instrument
Tag
Loc1 Loc2 Loc3 Loc4 Loc5
PM1_Temp.P
V
EVENT='PM1_Trigger 'ItemID1
1
0
0
2
1
PM1_Rate.PV EVENT='PM1_Trigger 'ItemID2
1
0
0
3
1
In this case, PM1_Trigger are tags that are updated by this interface, by
another interface, or by manual entry. When PM1_Trigger gets a new
event in the PI snapshot, the interface will send data for both
PM1_Temp.PV and PM1_Rate.PV to the PI server.