Siemens SIMATIC TI500 Especificaciones Pagina 188

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6-23
Cabling and Wiring the System
SIMATIC 545/555/575 System Manual
The rules for proper PROFIBUS-DP installation follow:
Create a daisy-chain arrangement, not a star arrangement. A daisy
chain has two connectors with a single cable (bus wire) connection; all
other connectors (if any) have two cable (bus wires) connections.
You can connect up to 32 devices on one cable segment. Repeaters count
as devices.
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. Wire all of
the TX/RX+ pins (terminal B on the Siemens connectors) together on
each slave device and on the PROFIBUS-DP annex card. Wire all of the
TX/RX pins (terminal A on the Siemens connectors) together to each
slave device and to the PROFIBUS-DP annex card. Crossing the wires
at any point in the system causes communication problems.
Proper termination and bias of PROFIBUS-DP cable is important for
reliable communication. The device at each extreme end of a
PROFIBUS-DP cable must be terminated and biased; any connections
made between extreme cable ends must not be terminated or biased.
See pages 6-24 and following for more information about termination
and bias.
Ground the chassis of each module to earth ground, as described in
Chapter 2.
All PROFIBUS-DP cable connectors must be properly grounded. With a
Siemens PROFIBUS-DP connector, proper grounding is accomplished
when the bare cable shield contacts the metal connector ground.
Tighten screws on all PROFIBUS-DP connectors throughout your
system to a maximum torque of 8 inlb (0.9 Nm) in order to ensure a
good ground connection.
Installing
PROFIBUS-DP Cable
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