Sharp DP-750 Manual de Serviço Página 123

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Field Bus Communication 123
PROFIBUS
WAGO-I/O-SYSTEM 750
Bus System
Further Information
The PNO provides further documentation for its members on internet:
- Technical descriptions
- Guidelines
http://www.profibus.com/
4.1.2 Wiring
On the PROFIBUS with RS 485 transmission technology all devices are
connected in a line structure. The bus line comprises of a twisted and screened
pair of wires.
The field bus line is specified in EN 50 170 as a line type A and must provide
certain line parameters. The line type B also described in the EN 50 170 is an
old type and should no longer be used.
Parameter Value
Wave resistance 135 ... 165
Operating capacity < 30 pF/m
Loop resistance 110 /km
Wire diameter
*)
> 0.64 mm
Wire cross section
*)
> 0.34 mm
2
*)
The wire cross sections used must conform with connection possibilities on the bus plug.
Line type A allows maximum line lengths for a bus segment dependent upon
the transmission speed.
Transmission speed Max. bus segment length
9.6 / 19.2 / 45.45 / 93.75 kBaud 1200 m
187.5 kBaud 1000 m
500 kBaud 400 m
1500 kBaud 200 m
3000 / 6000 / 12000 kBaud 100 m
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