Siemens SIMATIC C7-626, Installation, Assembly, Wiring

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3
3-15
C7-626 / C7-626 DP Control Systems
C79000-G7076-C626-01
3.4 Network Components
You require network components...
Table 3-5 Network Components
Purpose Component
... for setting up a network PROFIBUS bus cable
... for connecting a node to the
network Bus connector
... for amplifying the signal
... for linking segments
RS 485 repeater
... for converting the signal to
fiber-optic transmission
(PROFIBUS DP network only) Optical Link Module
... for connecting programming
devices/OPs to the network Programming device cables
(spur lines)
We offer the following PROFIBUS bus cables:
Table 3-6 Bus Cables
PROFIBUS bus cable
PROFIBUS direct-buried cable
PROFIBUS drum cable
PROFIBUS bus cable with PE sheath (for food and drinks industry)
PROFIBUS bus cable for festooning
The PROFIBUS bus cable is a two-core, twisted and shielded cable with the
following characteristics:
Table 3-7 Characteristics of the PROFIBUS Bus Cable
Features Values
Surge impedance Approx. 135 to 160
Ω
(f = 3 to 20
MHz)
Loop resistance
x
115
Ω
/km
Operating capacitance 30 nF/km
Attenuation 0.9 dB/100 m (f = 200 kHz)
Permissible core cross-section 0.3 mm
2
to 0.5 mm
2
Permissible cable diameter 8 mm
"
0.5 mm
Purpose
PROFIBUS Bus
Cable
Characteristics of
the PROFIBUS Bus
Cable
Configuring MPI Networks and PROFIBUS-DP Networks