Indu-Sol PROmesh P20, Руководство пользователя

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Device ports and status indicators
PROmesh P20 - User Manual 16
2.6 Network topology and media redundancy
Using the PROFINET application in your automation network makes it possible to flexibly integrate and
configure devices in your PLC domain, based on the Ethernet protocol.
This not only enables a higher data data throughput, but also makes it possible to distribute and integrate
the network devices among each other along different paths. A network segment in Ethernet-based
networks thus spans between each device pair.
Switches such as the PROmesh P20 thus play a key role in your automation network and should be suitable
for use in different network structures, to allow flexible expansion and adaptation of your system structure.
The PROmesh P20 makes it possible to achieve this expediently and conveniently, as it offers extensive
functions for networking and securing the communication of all network devices within the PLC domain.
2.6.1 Network topology
Typical Ethernet star structures (see Figure 5) can be networked with the PROmesh P20 switches without
further configuration. The devices are operable immediately.
In comparison to basic fieldbus systems, the PROFINET application allows MxN connection of all devices,
based on an Ethernet network structure, and thus enables direct network communication between two
devices. Basic meshing is described as a star structure (see Figure 6) in which each device can exchange
information with the other network devices via a central distributor. If the network structure is expanded by
meshing several star structures, a media-redundant multi-channel communication can be set up between
two devices. This increases the fail safety of the automation system significantly.
Here the switch, as a central element for forwarding this information, plays the key roll in forwarding data
to the appropriate receiver unchanged and with as little delay as possible. Additionally, the communication
should be restricted to one propagation path, to limit the strain on the line capacity that occurs in the case
of multi-path propagation.
The PROmesh P20 supports you in the task of setting up a slimline, expandable and efficient network
structure for your PROFINET domain.
In addition to full integration into the PROFINET domain, the PROmesh P20 can be subjected to a load of
up to Netload Class III (network limit).
Additionally, the PROmesh P20 supports the use of redundancy functions for intermeshed structures as
well.
Depending on the existing intermeshed structure in the PLC domain, different protocol functions have
shown to provide varying levels of performance and suitability.
The PROmesh P20 supports the following redundancy functions for preventing multi-path propagation of
the data communication in standard cases and to define an alternative route as fast as possible in the event
of an error.
The following protocols are supported by the PROmesh P20 .