Siemens RWF55.5 User Manual page 74

Cable data
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Data rate
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Building Technologies Division
Infrastructure & Cities Sector
The cable length specifications relate to cable type A described below:
Surge impedance
Capacitance per unit length
Loop resistance
Cross-sectional area
Preferably, a 9-pin D-Sub connector should be used for Profibus networks with RS-485
transmission technology. The pin assignments on the connector and the wiring
specifications are listed at the end of this chapter.
Several manufacturers offer Profibus DP cables and connectors. Please consult the
Profibus product catalog (www.profibus.com) for designations and reference
addresses.
Attention!
When connecting the devices, make sure you do not mix up the data lines. You must
use shielded data lines. The braided shield and the foil shield underneath it (where
applicable) should be connected at both sides and with a good conductive connection
to protective ground.
Additionally, where possible you must ensure that data lines are laid separately from
all power cables.
As an example of an appropriate cable, we recommend the following from Siemens:
Simatic Net Profibus 6XV1
Order no.: 830-0AH10
* (UL) CMX 75 °C (Shielded) AWG 22 *
With data rates of ≥1.5 Mbit/s, branching must be avoided during installation.
Note!
For additional installation information, please refer to the Profibus DP installation
guidelines (order no. 2.111) from the PNO.
Address:
Profibus Nutzorganisation e.V.
Haid- und Neu-Straße 7
76131 Karlsruhe
Internet: www.profibus.com
Recommendation:
Please observe the installation information provided by the PNO, especially in cases
where variable speed drives are being used simultaneously.
User Manual RWF55...
12 Profibus-DP interface
135...165 
<30 pf/m
110 /km
>0.34 mm²
CC1U7867en
05.11.2013