DeviceXPlorer 2007 is middleware that communicates with control devices and measuring instruments and then passes product information to each application. OPC interface enables exchanging data with each application. We used to develop each OPC Server for each PLCs. But from this version, you can access domestic 10 main PLCs such as Mitsubishi MELSEC, OMRON SYSMAC by only single product. We met customer's demand that occurred in various PLCs intermingle and multivender-ization is evolved. In addition, DeviceXPlorer 2007 has been enhanced with various functions substantially such as "RAS Function" that diagnoses connection number of OPC Client and status of accessing tag and, "Watch Function" that watches tag value.