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Related Products: |
EMMK-101, EMMK-102, EMMK-103 |
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Related Documents: |
ISCM-0380, ISCM-0385 |
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Type: |
Operation |
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Keywords/Labels: |
streams, watching live streams, historical streams |
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Summary: |
This article describes streams of data, how to watch a live stream, and loading historical streams. |
Cutsforth monitoring devices, such as Condition Monitoring Systems (CMS) and Motor Current Signature Analysis (MCSA) systems, are designed to detect when a piece of equipment enters a particular state of behavior, and then collect and group a series of data files until the equipment reaches a steady state. For example, a device might detect when a turbine begins a run-up when the speed measured by a tachometer increases to above 200 RPM, and then enter an operating state in which it collects and groups files. When devices group files in this way, the resulting files are referred to as a stream. The Data Viewer page provides several features for displaying data that has been acquired as part of a stream.
A stream is a single entity that combines many measurements from one device for the purpose of visualizing the data as a group. This is useful because by interacting with a single stream, you can quickly view all data the device acquired when the equipment was experiencing the behavior of interest. In the case of run-ups and coast-downs, where speed measurements cause a data group to enter a stream-enabled operating state, a stream contains the trend of speed measurements throughout the run-up or coast-down, as well as data from each sensor in the data group.
The following steps describe the actions that occur during a stream-enabled operating state to produce a stream:
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A device detects when a particular expression evaluates true and starts collecting files. For example, a device might detect a run-up when the speed increases to above 200 RPM, and then start a cycle of collecting ten seconds of data, waiting for fifteen seconds, and then repeating.
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InsightCM Server receives data from the device and makes the data available for viewing on the Data Viewer page.
Note
On the Data Viewer page, you can subscribe to the stream to update viewers with live data. See Watching a Live Stream.
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The device detects the stop condition that indicates the equipment reached a steady state, and then stops performing stream acquisitions.
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On the Data Viewer page, you can load the stream of data that the server created.
The following illustration shows the role of each component.
The following workspace shows the Data Viewer page with a run-up stream loaded. Notice the following characteristics:
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The Trend viewer contains a single trend of speed values from the tachometer whose measurements indicate a run-up and trigger stream acquisitions.
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The Trend viewer time axis is restricted to the duration of the run-up. In other words, you cannot adjust the time range to show other historical measurements that occurred before or after the run-up.
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Other viewers contain measurements from several different sensors.
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If you place a cursor in the Trend viewer and move it with the arrow keys, the data in the other viewers will update to match the timestamp of the Trend viewer.
Behavior when Devices Monitor Multiple Pieces of Equipment or Multiple Devices Monitor the Same Equipment
Streams consist of all the data that sensors on a specific data group acquire. A data group is a set of channels mapped to sensors that monitor the same piece of equipment. Data groups are useful in situations where a single device connects to sensors on multiple pieces of equipment whose data you want to acquire according to different parameters.
Multiple devices cannot share a data group. This means that if two devices monitor one piece of equipment, only data acquired by the one data group that experiences the enter condition is part of the stream.
If a device monitors two pieces of equipment, each with unique operating behaviors, ensure the pieces of equipment belong to separate data groups. Otherwise, if the data group experiences an enter condition that is relevant for only one piece of equipment, the device includes data from the second piece of equipment as part of the stream.
Data streams are similar to periodic acquisitions in the following ways.
Streams differ from periodic acquisitions in the following ways:
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Users can configure a device to continuously collect files at intervals of only a few minutes or delta EUs when it enters a stream-enabled operating state. However, periodic acquisitions might occur much less frequently, such as only when a time interval elapses or a delta EU or alarm condition evaluates true.
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Separate aging rules apply to stream and periodic data files.
View streams from all equipment or from one equipment as streams begin.
When a stream-enabled operating state is in progress, data viewers can display live trends and measurements as devices acquire data from equipment. Choose one of the following ways to begin viewing a stream.
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Click the Data Viewer (
) button. -
Determine how you want to view a stream.
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See when any of the equipment you have configured on the Asset Configuration page starts a stream.
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To view a stream from a particular equipment asset, complete the following steps.
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Click the Subscribe to Stream (
) button to allow all viewers to update with live data..
Note
If necessary, the Data Viewer page automatically switches to Stream Data mode so you can access viewers and other features that are useful for analyzing stream data. When a stream begins, the viewers automatically begin updating with data. If a stream is not in progress, the viewers remain empty. The Subscribe to Stream button is disabled until you select a piece of equipment with a stream-enabled operating state in the asset tree.
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The InsightCM Server treats data acquisitions differently depending on whether they occur during any stream-enabled operating state, such as a run-up or coast-down. Any acquisition that is not part of a stream is categorized as a periodic acquisition. The following table describes some of the differences between periodic and stream acquisitions.
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Acquisition Category |
Triggers |
Where to Configure |
Data Storage |
|---|---|---|---|
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Periodic |
Operating States tab on the Asset Configuration page |
Stored in a single data set. |
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|
Stream |
run-up or coast-down |
Operating States tab on the Asset Configuration page |
Stored in multiple data sets. |
Load streams that are stored in the server and view them on the Data Viewer page.
In Stream Data mode, you can load streams of data that occurred in the past and are stored in InsightCM. Complete the following steps to load a previously acquired stream.
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Click the Data Viewer (
) button. -
Click Load Stream (
) to view a list of previously recorded streams for each piece of equipment in the asset tree. -
Select a piece of equipment from the tree on the left to load available streams for that equipment.
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In the list of streams that populates on the right side of the dialog box, select the stream of interest and click OK.
Note
If necessary, the Data Viewer page automatically switches to Stream Data mode so you can access viewers and other features that are useful for analyzing stream data. When a stream begins, the viewers automatically begin updating with data. If a stream is not in progress, the viewers remain empty. The Subscribe to Stream button is disabled until you select a piece of equipment with a stream-enabled operating state in the asset tree.
When you load a stream, you can perform the same tasks you use to analyze data in periodic data mode.
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Move the cursor through the Trend viewer point by point. By default, the Trend viewer loads the speed feature from the tachometer that detected the stream-enabled operating state.
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Watch the timestamp and cursor value update in the metadata pane.
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Analyze data from all supported sensors in various viewers, even if the sensors are not loaded in the Trend viewer.
Conditions Where Data is Unavailable
The following behaviors can affect your ability to load data in Stream Data mode.
Note
You cannot load trends from assets that are not part of the stream.
The time range in viewers is restricted to the duration of the stream you load, so you cannot see additional data even from equipment that is part of the stream.