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[KB76]Refreshing Data Items from the EIB OPC Server

Tags: OPC, OPC-DA Server

Communication interfaces
16 years ago
By RM
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Applies to:

PcVue all versions.
Summary:

This article describes how to refresh the values of variables from the EIB OPC Server, after communication is disconnected and reconnected.
Details:

When communication is disconnected between the EIB (European Installation Bus) OPC Server and networked equipment, the items on the server have the status BAD. When communication is reconnected, the items are not returned to status GOOD unless an OPC client attempts to read them.

Solution (workaround)

From PcVue, run a cyclic SCADA BASIC program that reads the data items from the server, so as to refresh their values.

Notes (advice from EIB, edited)

  • A feature to read groups automatically every x seconds will be integrated in OPC Server 2.0 that will be released sometime in 2004.
  • The OPC Server only gives the states (values) of the groups and communication objects. Physical device information is of no use to an OPCServer; it needs to be handled by installation software such as ETS (Embedded Terminal Server).
  • At the time of writing, the current EIB OPC Server (1.6) is a very basic OPC Server in which 1 OPC Group exists with all the Object groups of the EIB network. All there is to know about it is described in the OPC standard; there are no special features.

For further information

– OPC standard and rules etc.

http://www.opcfoundation.org/

Created on: 15 Oct 2010 Last update: 13 May 2024