Installing The Profibus Cable; Profibus Cable Specifications - GE VersaPoint IC220PBI002 User Manual

4

Installing the Profibus Cable

When laying the Profibus cable, note the following:
▪
Do not lay signal and bus cables parallel to power cables or in bundles with
power cables.
▪
Lay Profibus cables and cables with direct voltages > 60V and alternating
voltages > 25V in separate bundles or cable channels.
▪
Always lay signal cables in one channel, following the shortest route.
▪
Avoid extending the Profibus cables with connectors.
▪
Do not lay Profibus cables in bundles with telephone lines and cables leading
to potentially explosive areas.
▪
Avoid branch lines.
Refer to the following cable specifications, connector description, and instructions
for cable shielding and bus termination.

Profibus Cable Specifications

The proper cable for a Profibus network is a shielded twisted pair cable. Profibus
cable is available from Siemens parts distributors and sold as "Profibus Network
Cable". The twisted pair cable consists of a Green and a Red wire. Below are
some of the cable characteristics of Profibus cable.
For data rates up to 500 kbits/second, follow the stub recommendations in the
Profibus technical standard. At 1500 kbits/second the overall drop capacity should
be less than 0.2nF. Maximum length of the stub at 1500 kbits/second is 6.6
meters.
4-14 VersaPoint™ I/O System Profibus-DP NIU User's Manual – August 2005
Profibus Network Cable
Profibus 9-pin Connector
Impedance
Capacity
Resistance
Wire Gauge
Conductor Area
Siemens part # 6XV1-830
Siemens part # 6ES7972
135 to 165 Ohms (3 to 20 MHz)
< 30 pF per meter
< 110 Ohms per Kilometer
> 0.64 mm (0.025 inch)
> 0.34 mm2 (AWG 22)
GFK-1911B