Siemens EF 83H Series Instrukcja Użytkownika Strona 47

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Connecting the Network
3-9
SIMATIC 505 PROFIBUS-FMS CP User Manual
The
rules for proper PROFIBUS installation follow:
Create a daisy-chain arrangement, not a star arrangement.
Y
ou can connect up to 32 devices on one cable segment. Each repeater
counts as a device.
Do not run the cables near power wires.
The communication cable consists of two color
-coded insulated wires
that are twisted together and surrounded by a shield. The cable is
encased in an insulating jacket. When wiring the system, the same
color of wire must be connected to the TX/RX+ pin throughout the
system.
Do not cross the TX/RX+ signals and the TX/RX– signals. W
ire all of
the TX/RX+ pins (terminal B on the Siemens connectors) together
. W
ire
all of the TX/RX– pins (terminal A on the Siemens connectors) together
.
Crossing the wires at any point in the system causes communication
problems.
Proper termination and bias of PROFIBUS cable is important for
reliable communication. The device at each end of a PROFIBUS cable
segment must be terminated and biased; any devices connected
between the end nodes of a segment must not be terminated or biased.
See the following pages for more information about termination and
bias.
All PROFIBUS cable connectors must be properly grounded. W
ith a
Siemens PROFIBUS connector
, proper grounding is accomplished when
the bare cable shield contacts the metal connector ground.
T
ighten screws on all PROFIBUS connectors throughout your system
to a maximum torque of 8 in-lb (0.9 N-m) in order to ensure a good
ground connection.
Installing
PROFIBUS Cable
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