Try the MatrikonOPC Server for Ethernet/IP for FREE now. The MatrikonOPC Server for Ethernet/IP download is shareware that can be distributed freely. It is a fully functioning application that can be used for 30 days after which time it must be licensed.
The MatrikonOPC Interface for Ethernet/IP provides access to controllers using Ethernet/IP (CIP over Ethernet), without the requirement for RSLinx. The server is installed on a Windows PC and uses the 1756 ENET/ENBT Module Gateway or 1761 NET-ENI to connect to the controller.