Bar code scanner to OPC or PLC or BOTH!
We have a product called DeviceMaster UP, which effectively allows a serial device AND an Ethernet device the ability to communicate simultaneously to the PLC via it's native Industrial Ethernet networking protocol (Ethernet/IP, PROFINET, Modbus/TCP) and via TCP/IP to an application (OPC).
If you'd like additional details, please contact me directly, or feel free to do a web search on DeviceMaster UP.