Network Components - Siemens SIMATIC C7-626 Installation, Assembly, Wiring

3.4

Network Components

Purpose You require network components...
Table 3-5
... for setting up a network
... for connecting a node to the
network
... for amplifying the signal
... for linking segments
... for converting the signal to
fiber-optic transmission
(PROFIBUS DP network only)
... for connecting programming
devices/OPs to the network
PROFIBUS Bus We offer the following PROFIBUS bus cables:
Cable
Table 3-6
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
Characteristics of
The PROFIBUS bus cable is a two-core, twisted and shielded cable with the
the PROFIBUS Bus
following characteristics:
Cable
Table 3-7
Features
Surge impedance
Loop resistance
Operating capacitance
Attenuation
Permissible core cross-section
Permissible cable diameter
C7-626 / C7-626 DP Control Systems
C79000-G7076-C626-01
Configuring MPI Networks and PROFIBUS-DP Networks

Network Components

Purpose
PROFIBUS bus cable
Bus connector
RS 485 repeater
Optical Link Module
Programming device cables
(spur lines)
Bus Cables
Characteristics of the PROFIBUS Bus Cable
Values
Approx. 135 to 160 Ω (f = 3 to 20
MHz)
30 nF/km
0.9 dB/100 m (f = 200 kHz)
0.3 mm
8 mm
Component
115 Ω/km
2 2
to 0.5 mm
0.5 mm
3
3-15