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OPC to AB Data Highway Plus/485 network

Which OPC server/driver is needed to communicate with PLC-5s and/or SLC500 PLCs on an AB DH+ network using the AB 1784 PKTX card or other Data Highway physical interface cards?

Allen-Bradley DataHighway connectivity is no longer supported via physical interface cards starting with TOP Server V6.10.623.0.  Please click here for details on alternative methods of connecting to your DataHighway capable PLCs.