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disp

Summary of information for OPC objects

Syntax

Obj
disp(Obj)

Description

Obj or disp(Obj) displays summary information for the OPC object Obj.

If Obj is an array of objects, disp outputs a table of summary information about the objects in the array.

Summary information includes the following information as appropriate for each item in dObj.

  • ItemID: The item ID for that element.

  • Value: The number and data type of the values for that element.

  • Start TimeStamp: The time of the first value in the element. The time is displayed in the format specified by the OPC date display format that can you set using opc.setDateDisplayFormat

  • End TimeStamp: The time of the last value in the element.

  • Quality: The number of unique qualities contained in the element. If all values have the same quality, that HDA quality is displayed.

You can get more information about a OPC HDA data objects by using the showValues method.

Alternatively, you can display summary information for Obj by excluding the semicolon when:

  • Creating a toolbox object, using the opcda, addgroup, or additem functions

  • Configuring property values using dot notation

Examples

Display the summary of a data access client:

da = opcda('localhost', 'My.Server.1')
da =

Summary of OPC Data Access Client Object: localhost/My.Server.1

   Server Parameters
      Host      : localhost
      ServerID  : My.Server.1
      Status    : disconnected
      Timeout   : 10 seconds

   Object Parameters
      Group     : 0-by-1 dagroup object
      Event Log : 0 of 1000 events

Display the summary information for an array of data access clients:

da2 = opcda('localhost', 'My.Second.Server.1');
[da da2]
   OPC Data Access Object Array:

   Index:  Status:         Name:
   1       disconnected    localhost/My.Server.1
   2       disconnected    localhost/My.Second.Server.1

Load the OPC HDA example data file and display the hdaDataSmall object:

load opcSampleHdaData;
disp(hdaDataSmall)

Version History

Introduced before R2006a

See Also

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