matrikon opc server for allen-bradley User Manual

Matrikon OPC Server for Allen Bradley

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Solution: Either set the identity for the OPC server to the interactive user, or else consider
run the server as an NT service. See the section on DCOM for more information.

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Problem: After installing an older OPC server, DA 2.0 asynchronous I/O no longer
works.

Solution: The old installation program installed and registered its own (older) version of the
OPC proxy/stub DLL. Reinstall the standard OPC proxy/stub DLL's using an up-to-date
installation program or re-register them using the REGSVR32 command- line utility. See the
section on server installation for more information.

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Problem: How can I get OPC data into Microsoft Excel, Microsoft Word, or another
application with support for Visual Basic, VBA, or VB Script?

Solution: Use the Matrikon OPC Automation Component to create a Visual Basic script that
connects to a server, creates groups and items, and receives data change updates. See the
installed files for examples of how to do this in Excel, Visual Basic, or an HTML document.

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Problem: How can I access individual bits from an integer item?

Solution: Create an alias that references the desired item and configure scaling for the alias to
use expression evaluation. Edit the input expression to use binary math to access a particular
bit (i.e. “IF((INPUT AND 4)=4, 1, 0)” to access bit 2). This method allows read access only.

Contact: support@matrikon.com