configure a ethernet link
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Send & Receive is originally designed to exchange data between Freelance systems. Thus Freelance uses specific header data in the frame. The send function block is able to send without header and therefor the PLC can receive. That is also described in the Freelance manual communication and fieldbuses.
Sorry took sometime, I have seen this on internet and found it's link finally @ http://cache.automation.siemens.com/dnl/DA/DAzNTcxMwAA_39168210_Tools/39168210_