Installation
Electrical installation
Wiring with a host (master)
5
l
22
EDS82ZAFPC201 EN 4.0
Specification of the transmission cable
) Note!
Only use cables complying with the listed specifications of the PROFIBUS user
organisation.
Field Values
Specific resistance 135 ... 165 W/km, (f = 3 ... 20 MHz)
Capacitance per unit length £ 30 nF/km
Loop resistance < 110 W/km
Core diameter > 0.64 mm
Core cross−section > 0.34 mm
2
Cores Twisted double, insulated and shielded
Bus cable length
The length of the bus cable depends on the baud rate used:
Baud rate [kbps] Length [m]
9.6 ... 93.75 1200
187.5 1000
500 400
1500 200
3000 ... 12000 100
) Note!
The baud rate depending on the data volume, cycle time, and number of nodes
should only be selected as high as required for the application.
I Tip!
For high baud rates we recommend to consider the use of optical fibres.
Advantages of optical fibres:
ƒ On the transmission path external electromagnetic interference remains
ineffective.
ƒ Bus lengths of several kilometres are also possible with higher baud rates.
The bus length
– is irrespective of the baud rate.
– depends on the optical fibre used.
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