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Cloud Proxy Ext (nCloudDriver-CloudProxyExt)

This component is a Niagara Proxy Extension configured to push point data to the cloud. Its configuration indicates from where the point’s data originate, including details specific to the NiagaraCloudNetwork and Niagara Cloud.

The proxy points can be individually enabled/disabled. But they start out enabled by default, no manual step is required. Also, the point data is pushed to the cloud only on every change if it is configured for COV (Change Of Value).

 NOTE: Only a small number of points should be configured for COV as it can cause significant performance problems. A better practice is to use batch updates. 
Figure 45.   Cloud Proxy Ext properties
Image

To access these properties, expand Config > Drivers > NiagaraCloudNetwork > CloudSentienceDevice > Points > Numeric Point, right-click proxy Point and click Views > AX Property Sheet.

In addition to the standard properties (Status, Fault Cause and Enabled), these properties support this component.

Name Value Description
Device Facets trueText (default) or falseText Facets contain key/value pairs applied to input and output values. These sample facets are for a boolean point. They will be different for other point types.
  • trueText is the text to display when output is true
  • falseText is the text to display when output is false.

For example, you might want to set the key trueText to display “ON” and the key falseText to display “OFF.”

Other keys are units, precision, etc.

You can edit Facets from a component Property sheet by clicking the >> icon to display the Config Facets window.
Conversion drop-down list
Defines how the system converts proxy extension units to parent point units.

Default automatically converts similar units (such as Fahrenheit to Celsius) within the proxy point.

 NOTE: In most cases, the standard Default conversion is best.  

Linear applies to voltage input, resistive input and voltage output writable points. Works with linear-acting devices. You use the Scale and Offset properties to convert the output value to a unit other than that defined by device facets.

Linear With Unit is an extension to the existing linear conversion property. This specifies whether the unit conversion should occur on “Device Value” or “Proxy Value”. The new linear with unit convertor, will have a property to indicate whether the unit conversion should take place before or after the scale/offset conversion.

Reverse Polarity applies only to Boolean input and relay output writable points. Reverses the logic of the hardware binary input or output.

500 Ohm Shunt applies to voltage input points only. It reads a 4-to-20mA sensor, where the Ui input requires a 500 ohm resistor wired across (shunting) the input terminals.

Tabular Thermistor applies to only a Thermistor input point and involves a custom resistance-to-temperature value response curve for Type 3 Thermistor temperature sensors.

Thermistor Type 3 applies to an Thermistor Input point, where this selection provides a “built-in” input resistance-to-temperature value response curve for Type 3 Thermistor temperature sensors.

Generic Tabular applies to non-linear support for devices other than for thermistor temperature sensors with units in temperature. Generic Tabular uses a lookup table method similar to the “Thermistor Tabular” conversion, but without predefined output units.

Tuning Policy Name Priority Policy, Default Policy, Background Policy Defines rules for managing how station data are sent to and received from the cloud, including update group, COV, change requirements, and duration of COV mode and cloud writes.
Read Value read-only Shows the last value that was successfully sent to the cloud, for example "71 {ok}" or "false {ok}". Read Value is updated automatically upon successful write, as the value is not "read" from the cloud.
Write Value read-only Shows the last value written to the cloud, as well as the state and priority level, for example, “70 {overridden} @8”. The Write Value is a value that this station's source point has taken on, which needs to be written up to the cloud database.
Ord Path slot:/ Defines the Ord path for the source point in the local station.
Point Id read-only Reports a unique ID (status/ord path) with the station name added to the point path. This is the reference value that is used to retrieve the data from the cloud, and for sending data from the cloud to the station.
Cloud Write Info read-only In Niagara 4.10/FC 1.2 and later, if a write is active each Cloud Write Info command coming in from the cloud receives its own slot on the cloud proxy extension dynamically, and links the value to the source station point at the priority level specified by the write. Cloud Write Info provides the following details: the Honeywell Forge Point ID of the point being written, the new value, the priority level at which to write, the duration that this write should remain active (after this time the write is cancelled), and the application or user issuing the write.
Is COV Active read-only Indicates if the Cloud Proxy Ext is currently in COV mode or not.

If a point is placed into COV, there is a property called Cov To Cloud Value that is added while the point is in COV mode, which contains the value from the source point, to be pushed to the cloud via COV update message.

Cov To Cloud Value read-only Not present by default, but if a point is placed into COV, the driver adds this property while the point is in COV mode. It contains the value from the source point to be pushed to the cloud via COV update message.
Last Sent To Cloud read-only timestamp Shows the date and time the last point update was sent to the

Related Links

  • Components and other references (Parent Topic)

    • Related Tasks

  • Configuring point data for the cloud using Cloud Point Learn

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