Connecting
3.7 Connecting PROFIBUS/MPI
SIMOTION D4x5-2
Commissioning and Hardware Installation Manual, 02/2012
67
Removing the bus connector
You can remove the bus connector with a looped-through bus cable from the PROFIBUS DP
interface at any time without interrupting data traffic on the bus.
WARNING
Data traffic error might occur on the bus!
A bus segment must always be terminated with the terminating resistor at both ends. This
is not the case, for example, if the last node with a bus connector is de-energized. The bus
connector draws its power from the node, and the terminating resistor is thus disabled.
Make sure that the stations at which the terminating resistor is connected are always
energized.
See also
PROFIBUS cables and connectors (Page 64)
Length of PROFIBUS cables (Page 65)
3.7.6 Connection rules in the PROFIBUS subnet
Introduction
There are a number of rules for configuring and installing cables for PROFIBUS networks to
ensure seamless communication over PROFIBUS. These rules apply to both configuring and
cabling as well as address assignment for the different network nodes.
Connection rules
● Before you interconnect individual nodes in a subnet, you must assign a unique
PROFIBUS address to each node.
● Narrow down the number of nodes by limiting the PROFIBUS addresses to the highest
address in the network.
Tip: Mark the address on the housing of all nodes in a subnet. Then you can always see
which address is assigned to which node in your system.
● Connect all nodes in a subnet "in series". No spur lines may be routed to the
PROFIBUS DP.
In addition, integrate the programming devices and SIMATIC HMI devices for
commissioning or servicing in the subnet in series.
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