17
of 175
NOTE
Take care not to swap over the data lines when connecting the stations.
•
Always install the bus termination at the
start and end of the bus line
. The bus
termination uses the supply voltage VP from the device, so ensure that the voltage
supply to the slave device on which the bus termination is installed is always on.
Since the connectors contain built-in series inductors, avoid fitting connectors that
are not connected to field devices, because the non-existent device capacitance
may cause transmission errors.
•
It is essential to use a shielded PROFIBUS cable in order to achieve high system
immunity to radiated electromagnetic interference. As far as possible, the shield
should be connected at both ends to the protective ground via large-area shielding
clamps providing good conducting contact. In addition, ensure that the cable is
positioned as far as possible from all power cables. At data rates
≥
1.5 Mbit/s, stubs
must be avoided at all costs.
•
An equipotential bonding conductor must be installed to reduce potential differences
introduced by different network input points from different parts of the system
4.3 Configuring a PROFIBUS.DP system
PROFIBUS-DP
PLC
System configuration
Device master data files GSD files
Drive
I/O
module
PROFIBUS
configurator
burster
9310
burster
9307
Field
device
Field
device