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5. External connections5.5 Serial interfaces for communication with PLCs or devices5.5.2.2 RS-485 topologyl A bus segment can interconnect up to 32 slaves.l Several bus segments can be connected using repeaters (bi-directional amplifiers).The use of repeaters enables the maximum cable length to beincreased.For more details, please consult the documentation provided by man-ufacturer.A bus segment must be provided with cable termination (120 Ohm) at both ends.These terminals must be connected in the plug directly between pin 3 and 7.The bus segment must be terminated at both ends.No more than two terminations must be provided for each bus seg-ment.Operation without correct cable termination can cause transfererrors.1236754 891201236754 891201236754 891236754 89GNDABGNDABGNDABGNDABGNDABGNDABFigure 33: Bus segment with four nodesXV300 04/19 MN048017EN www.eaton.eu 63 |
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