JsonExportDeregistrationHandler (Json Export Deregistration Handler)
This component works with the JsonExportSetpointHandler to remove a unique identifier from an external system to an export marker.
Figure 74. JsonExportDeregistrationHandler properties
To add this handler to a station, expand the ExportMarker folder in the palette and drag this component to the router folder in the Nav tree.
In addition to the standard property (Enabled), these properties support the JsonExportDeregistrationHandler.
| Property | Value | Description |
|---|---|---|
| Last Result | read-only | Reports the results of the alarm acknowledgment to allow for logging or post-processing activity. Example output:
|
| Last Result Time | read-only | Reports when the handler ran last. |
| Last Input | read-only | Reports the last JSON string input, which was routed through this component. This string either successfully altered a setpoint
or failed as indicated by the Status property.
|
| Remote Key | text (defaults to platformId) | Identifies the name of the JSON property that denotes the point's identifier in the remote system. |
Syntax
The messages should be in this format:
{
"messageType" : "registerId"
"niagaraId" : "h:a032",
"platformId" : "mooseForce123"
}or
{
"messageType" : "deregisterId"
"platformId" : "mooseForce123",
}NOTE: This class does not use the
messageType, which would be used simply to route it to this handler and so can be changed as needed.Example
This Wire Sheet and JSON loosely demonstrate some of the routers and selectors based upon a fictional point search JSON message.
Figure 75. Json Export Registration Handler example Wire Sheet and JSON
