The CSI 9420 publishing policy is a credit-based system to control automated data requests and publishing rates. It helps you easily limit data traffic and data collection on your CSI 9420 transmitters. For CSI 9420 transmitters with a Smart Power Module, a publishing policy also helps extend the life of the power module by limiting the data collection and publishing. The publishing policy does not prevent on-demand readings. You can collect an on-demand reading from the CSI 9420 at any time.
The publishing policy may help if you have many transmitters and have some of the following concerns:
- You want to conserve the life of your Smart Power Module.
- You may have a control environment.
- You want to limit how often you request data.
- You want to limit how often you collect and store data.
Consider the following example in which a CSI 9420 is configured for a 60 minute update rate and to request the PeakVue spectrum whenever the PeakVue value exceeds 10 g's. If the measurement stays above 10 g's for an extended period of time, AMS Machinery Manager, without a publishing policy, would request a new spectrum with every measurement or once every hour. Each subsequent spectrum adds relatively little value in terms of diagnostic capability, but continues to consume power, which needlessly shortens the life of the power module. It also consumes unnecessary bandwidth, which might jeopardize the system's ability to retrieve pertinent diagnostic data from other devices. The default CSI 9420 publishing policy would restrict duplicate transmissions from this particular transmitter for two weeks. If the PeakVue level were still above 10 g at that time, then the publishing policy would permit the transmitter to send through an additional spectrum. This pattern would continue every 2 weeks until the issue is resolved.
How a publishing policy works
The publishing policy is based on gateway credits, device credits, and a polling interval. Credits are consumed by automated data collection based on the acquisition type. On-demand acquisitions do not consume credits. The credits are applied and used per polling interval. If the polling interval is too short, a device may send data too often, clog the network bandwidth, and run down the power module. Therefore, you should set the polling interval to the longest time period that is practical.
| Acquisition | Credit |
|---|---|
| Spectrum (time-based or alert-based) | 1 |
| Waveform (time-based or alert-based) | 2 |
| Spectrum or Waveform (on-demand) | 0 |
You can determine if a device has consumed all of its credits by viewing the CSI 9420 device status. In Data Import, expand the Device Hierarchy to a CSI 9420, right-click the CSI 9420, and select Get Status. A status message at the bottom of the screen displays the date and time when the device will be eligible to collect data automatically.
Data storage and retrieval order with alert-based data collection
Combining a publishing policy with alert-based automated data collection provides more control over data collection, while ensuring you have the latest data when the conditions worsen. If more than one transmitter sends alerts at the same time, the requests are handled on a first come, first served basis. Newer transmitters (units with software rev 6.0 or higher) will retain the alert data in a protected memory buffer until it is retrieved by AMS Machinery Manager. For older transmitters (units with software below rev 6.0), AMS Machinery Manager will retrieve whatever data is contained in the transmitter's memory at the time the request is processed. Also, with a newer transmitter, if the condition gets worse while the data is waiting to be retrieved, the transmitter will update its stored data with the latest measurement due to the higher alert level.
How to apply a publishing policy
You can apply a publishing policy globally to a Data Import Server or individually to each gateway device.
- Apply a publishing policy to a Data Import Server to affect each gateway monitored by that server.
- Apply a publishing policy to one gateway device to affect only the CSI 9420 transmitters connected to that gateway device.