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128 • ETHERNETNetwork Architecture – Principles and RegulationsWAGO-I/O-SYSTEM 750ETHERNET TCP/IPS-UTP cable (screened unshielded twisted pair) is single-shielded cable ofCategory 5 with overall shield surrounding all twisted unshielded conductorpairs and an impedance of 100 ohm.STP cable (shielded twisted pair) is cable of Category 5 with stranded andindividually shielded conductor pairs; no overall shield is provided.Wiring of the fieldbus nodesA crossover cable is required for direct connection of a fieldbus node to thenetwork card of the PC.Fig. 5-2: Direct Connection of a Node with Crossover Cable g012906dIf several fieldbus nodes are to be connected to a network card, the fieldbusnodes can be connected via an ETHERNET switch or hub with straightthrough/parallel cables.Fig. 5-3: Connection of a Node by means of a Hub with Parallel cables g012908dAn ETHERNET switch is a device that allows all connected devices totransmit and receive data with each other. The switch can also be viewed as a“data traffic cop” where the hub “polices” the data coming in and going out ofthe individual ports, so the data will only be transmitted to the required node.WAGO recommends using a switch rather then a hub, this will allow for amore deterministic architecture.AttentionThe cable length between the node and the hub cannot be longer than 100 m(328 ft.) without adding signal conditioning systems (i.e., repeaters). Variouspossibilities are described in the ETHERNET standard for networks coveringlarger distances. |
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