You will need to identify what protocol you wish to talk over ethernet such as Modbus TCP/IP, Devicenet (ethernetIP), Interbus, etc. so that you can find the correct product.
look at "http://www.prolinxgateways.com/":http://www.prolinxgateways.com/ thay offer communications gateways that allow the exchange of data between different networks and
protocols. This type of gateway will not allow programing etc, but will allow data exchange. I believe the profibus to modbus tcp/ip may
be helpful to you.
You are not clear about what it is you need to do exactly, but you might be able to do something with the Applicom PCI1000ETH card with supports
various types of industrial ethernets including Siemens Industrial Ethernet (H1)over ISO. Look at the following link: