Issue Details
Is there any difference between Streams and Periodic Acquisition in InsightCM?
Solution/Procedure
Yes. Streams and Periodic Acquisition are two distinct methods of collecting data in InsightCM. They differ in what triggers them, how often they collect data, how the data is scoped and viewed, and the aging rules applied to them.
What Is a Stream?
A stream is a single entity that combines many measurements from one device so you can visualize the data as a group. By interacting with one stream, you can quickly review everything the device acquired while the equipment was exhibiting the behavior of interest.
Streams are most common with run-ups and coast-downs, where speed measurements push a data group into a stream-enabled operating state. In those cases, a stream contains the trend of speed measurements throughout the run-up or coast-down, plus the data from every sensor in the data group.
Key Points About Streams
1. Streams can only be triggered on the Speed Feature of an asset.
2. Stream settings are configured per equipment on the Properties tab of the Asset Configuration page.
3. A stream consists of all the data acquired by the sensors in a single data group (a set of channels mapped to sensors monitoring the same piece of equipment).
4. When a stream is loaded, the Trend Viewer time axis is restricted to the duration of the run-up or coast-down and you cannot view measurements from before or after the event.
Streams vs. Periodic Acquisition
| Aspect | Stream | Periodic Acquisition |
|---|---|---|
| Trigger | Equipment entering a stream-enabled operating state (Speed Feature only, e.g., run-up/coast-down) | A time interval elapsing, a delta Engineering Units (EU) change, or an alarm condition |
| Collection frequency | Continuous, at short intervals (e.g., every few minutes or by delta EUs) while the operating state is active | Typically much less frequent |
| Duration / scope | Bound to a single operating event; data is grouped into one viewable entity | Ongoing, individual acquisitions over time |
| Aging rules | Has its own aging rules | Has separate aging rules |
| Viewing constraint | Time axis restricted to the duration of the stream | Standard historical range available |
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