Using OpcCmd Utility as OPC A&E Client

For general information about the OpcCmd tool, see Category:OpcCmd Utility.

Commands, Arguments and Options

Command: aeClient subscribeEvents

Example:

OpcCmd -i
aeclient
subscribeEvents OPCLabs.KitEventServer.2

Command: aeClient acknowledgeCondition

The acknowledgeCondition command (can be shortened to ac) acknowledges a condition in the events server.

Acknowledging a condition requires an event to be identified by a precise combination of several pieces of information. In order to make the acknowledging easier, the acknowledgeCondition command allows you to pick the event from those collected during previous event subscriptions. Using the --eventIndex option (can be shortened to -ei), you specify the index of the event you want to acknowledge.

When event output is on, the event indexes appear in front of every displayed event in angle brackets, such as "[2]". You can also use the events? command (ev?) to display the events previously collected.

Example:

OpcCmd -i
aeclient
subscribeEvents OPCLabs.KitEventServer.2 -sqn Simulation.ConditionState1
events?
acknowledgeCondition --eventIndex 2

In order to trigger an acknowledgeable event for the previous example, you can start a second instance of the OpcCmd utility and pass it a corresponding command, like this:

OpcCmd writeItem OPCLabs.KitServer.2 SimulateEvents.ConditionState1.Activate [Boolean]True

Using OPC NET API implementation

If you want to use the OPC NET API implementation instead of the native implementation (in OpcCmd for .NET Framework), you can do it interactively as in the following example:

OpcCmd -i
aeclient --property InstanceParameters.EnableNativeClient=[Boolean]false
subscribeEvents subscribeEvents OPCLabs.KitEventServer.2

If you want to use such setting permanently, you can modify one of the OpcCmd Intrinsic Component Configuration files (JSON, INI or XML). For example, with the JSON format, put the following into the appsettings.json or appsettings.production.json file:

{
  "OpcLabs.EasyOpc.AlarmsAndEvents.EasyAEClient": {
    "InstanceParameters": {
      "EnableNativeClient": false
    }
  } 
}