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Hello, all ! We are looking for an OPC Server to communicate to Siemens PLC, models S5 and S7/400. We are currently using Siemens's OPC Server, but they have changed their distribution (read pricing) policy and the costs have become way too much for our budget. A search at opcfoundation.org did not produce any results. We will be using WNT 4.0 and VB as clients. Any help is greatly appreciated. TIA, -- Hevelton Araujo Junior Ger=EAncia de Engenharia Tel.: +55-31-34275852 Fax.: +55-31-34912077 [email protected]