SIEMENS
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Siemens ST PCS 7 · 2017 (Preliminary edition)
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Design
(continued)
Communication
Industrial Ethernet
Industrial Ethernet plant bus
The automation systems (AS) communicate with one another
and with the engineering system and operator systems (servers/
single stations) over the Industrial Ethernet plant bus. This can
be configured in a similar way to the terminal bus, using SIMATIC
NET standard components such as Industrial Ethernet switches,
network adapters, communication modules (CP), cabling, etc.
For small plants with up to eight standard automation systems
per Operator System, single stations and servers can be effi-
ciently operated on the plant bus using "Basic Communication
Ethernet" (BCE) and a FastEthernet network adapter. The
CP 1623/CP 1628 communication module is always required if
more than eight automation systems or redundant automation
systems are used.
As far as availability is concerned, ring topologies are always the
first choice for the plant bus. With particularly high availability re-
quirements, the plant bus can also be configured as a redundant
double ring (two CPs per AS CPU and OS server). Double faults
such as a switch failure on ring 1 with a simultaneous interruption
in the bus cable on ring 2 can then be tolerated. The two rings in
such a configuration are physically separated. The coupling
partners are linked together logically when configuring with Net-
Pro over a fault-tolerant S7 connection (4-way redundancy). One
switch each takes over the function of the redundancy manager
for each ring. The current switches of the SCALANCE X-500,
X-400, X-300 and X-200 product lines can act as redundancy
manager in a ring.
Note:
Detailed information on Industrial Ethernet and on the network
components can be found in Catalog IK PI, in the Industry Mall,
or in Catalog CA 01 under "Industrial Communication".
© Siemens AG 2017