PointExt

Summary

The PointExt allows a point to interact with a remote Service.
The Point will be able to send data but it will also be possible to modify the point from the Service.

Implementation

• First you must setup a RealTimeConnector and a parent Device with a DeviceExt.

• Drag and drop the PointExt from the palette to any Point.

• If needed change the Device Query to target a Component with a DeviceExt and initialize the PointExt.

Properties

• Status: Status of the PointExt. 

• FaultCause: Message that complements the PointExt status (generally used to explain the reason for an initialization failure).

• Enabled: Indicates whether the Extension is enabled or not.

• DeviceQuery: Ord to the related Device.

• TriggerOnValueChangeOnly: By default a value is sent only if the extension detects a change. but you can change this by switching this property to false.

• CanWrite: Determines whether the database can change the value of the parent WritablePoint through a command.

Advanced Config

• InhibitTimeOnStart: Delay the messages sent during the station start.

• MinSendTime: The Minimum time between two sent messages. Any attempt made during this interval will be cancelled.

• MaxSendTime: The Maximum time between two sent messages, even if the point hasn't changed.

• Randomization: Allows to add a random duration to the first maxSendTime. Prevents a burst of message if many points, which don't change, have the same maxSendTime.

• ChangeTolerance: Available only on NumericPoints. Determines the smallest change in the out value which will send a message. 

Actions

• Initialize : Register the point and initialize the connection with the Service.

• Disable : Disable the extension.

• Clean : Unregister the point.

Fault Causes

• No Device Found : Make sure that your query points to a component that contains at least one device extension.

• Cannot Send Message : Make sure the the extension is working and the connector too.

• Extension Is Disabled : Try to enable your device extension.