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PRS – PROFIBUS DP REDUNDANCY SWITCH
PRS – the optimal solution for the realisation of redundant DP Master systems.
PRS is a compact 24 Volt hat rail
module for the connection of two DP
Masters as input and one PROFIBUS
network connected to the DP Slaves as
output.
The device avoids all disadvantages of
present redundancy concepts because
PRS generally prevents the DP Masters
from simultaneously connecting to the
PROFIBUS.
Present PROFIBUS DP Master
redundancy concepts are software
based DP multi Master solutions,
where the operational and the
redundant DP Master exchange live
information via the PROFIBUS line. In
case of failure of the operational DP
Master the redundant DP Master
assumes the hitchless communication
with the DP Slaves. The redundant DP
Master also has to be parameterised to
the PROFIBUS address of the faulty
operational DP Master. This concept is
called the Flying Master Algorithm. This
principle goes along with several risks:
If the faulty DP Master does not disable
its PROFIBUS bus traffic, a double
address conflict occurs and the whole
network will stop. A further
disadvantage is the fact that many DP
Master implementations on the market
do not support the Flying Master
Algorithm.
However PRS works with every
standard PROFIBUS DP Master and also
allows the simple upgrade of an
existing plant for redundancy
operation. The device automatically
detects the state of the two DP
masters. In case of failure of the
operational DP Master, the device
switches the PROFIBUS line over to the
redundant DP Master within milliseconds.
Both DP Masters can be
configured identically, that simplifies
the exchange of a defect system. A
failure of PRS does not cause a total
breakdown because the current state is
guaranteed even if the power supply is
disconnected.
PRS is a double DP Slave that can be
easily added to the DP Master s
PROFIBUS configuration via its GSD
file.
The device provides important
information for the redundancy
operation, such as:
The alive state of the complementary
system
A manual switch-over command on
the command level
PRS also allows the realization of very
complex redundancy systems, i.e. in
connection with PROFIBUS OPC servers
or overlying Ethernet based cell
networks.
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