Kepware's Allen-Bradley Unsolicited Ethernet device driver works in conjunction with our OPC/DDE Server, KEPServerEX to provide data exchange between OPC & DDE Clients and Allen-Bradley PLC-2 compliant PLCs via Ethernet. The Unsolicited driver allows an OPC client application to appear as 1 to 256 Allen-Bradley devices on the network. The slave mode allows the server to receive data by exception from an Allen-Bradley master. As with any slave device, the Allen-Bradley Unsolicited driver will only transfer data when being read or written by a master. KEPServerEX automatically optimizes your data acquisition based on client demand. Dataintegrity is ensured with our extensive error handling.