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If a S7 200 ,S7 300 or S7 400 has to be connected with a PC via Ethernet, the normal way is to take a CP / Communication processor.
IBH Link Plus
echocollect Upgrade table size (200 items)
echocollect Upgrade Flash, Logger (incl. 8 GB SD-Card)
echocollect se (Serial and Ethernet)
echocollect S5 PLC backup