Historain SE Polled Vs Advised Data Collection

When setting up a FactoryTalk Historian SE application you have to add data points to be monitored and store the results. These data points can be added as “polled” data points or “advised” data points.

Polled Mode Data Collection

Polled tags (data) are set to be stored once every interval (ex. every 1 second) regardless  of whether they change or not.

There is also a value called “ExcMax” that can be used with polled data collection model to force the data collection after a set period of time even if the data doesn’t change. So if the “ExcMax” is set to 180 (second), the tag will be stored after 180 seconds even if it didn’t change.

• Set Value “location 3” to “0″
• Stores data at specified interval
• Works for unchanging data
• Works with ExcMax

Advised Mode Data Collection

The advised tags (data) are set to be stored every time they change or after a period of time. So for example the an advised tag can be set on scan every 10 seconds. If the tag changes during that time it will be recorded otherwise it will not.

• Set Value “location 3” to “1″
• Less network intensive
• Will NOT work for unchanging data
• Will NOT work with ExcMax

Related posts:

1. FactoryTalk Historian SE Exception Filter
2. FactoryTalk Historian SE Compression Filter
3. FactoryTalk Transaction Manager Data Management Software