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Description
1.1
Application and function
Application
The PN/PN coupler is used to link two Ethernet subnets with one another and to exchange
data. That way use data about input or output address areas or datasets can be used. The
maximum size of the transferable input and output data is 1024 bytes. The division into input
and output data is preferable, so that e.g. 800 byte input data and 200 byte output data can
be configured.
As a device, the PN/PN coupler has two PROFINET interfaces, each of which is linked to
one subnet.
In the configuration, two IO Devices are produced from this one PN/PN coupler which means
that there is one IO Device for each station with its own subnet. The other part of PN/PN
coupler in each case is known as the bus node. Once configuring is complete, the two parts
are joined.
Figure 1-1
Coupling two PROFINET IO subnets with one PN/PN coupler
Principle of operation
● Data exchange with I/O modules
● Data record transfer
PN/PN coupler
Installation and Operating Manual, 06/2010, A5E00717043-04
Through the configured inputs of a slot, the local CPU reads the values that the CPU of
the other subnet writes over the configured outputs of the coupling partner.
Through the configured outputs of a slot, the local CPU writes values that the CPU of the
other subnet receives over the configured inputs of the coupling partner.
The module types Publisher und Storage address the DS task through module addresses
during the dataset transfer.
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