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Siemens ST PCS 7 · 2017 (Preliminary edition)
10
Communication
Industrial Ethernet
■
Design
The following Ethernet communications interfaces are used in
the various SIMATIC PCS 7 subsystems (ES, OS, AS etc.):
•
Interfaces integrated onboard
•
Simple network adapters
•
Special communication modules, for example CP 1623 and
CP 1628
These are defined when selecting the respective system compo-
nents depending on the requirements. For further information,
see Section "System connection of PCS 7 systems",
see page
10/59
The communication stations can be integrated in the terminal
bus and the plant bus using Industrial Ethernet Switches of the
SCALANCE X product family. These switches offer scalable per-
formance at an attractive price and support a wide variety of
configuration options.
Configuration example for plant and terminal bus
Terminal bus
Client-server and server-server communication is carried out on
a dedicated Ethernet LAN. The communication network identi-
fied as terminal bus can be implemented with standard SIMATIC
NET components such as Industrial Ethernet switches, onboard
interfaces, network adapters, communications processors (CP),
cabling, etc.
A ring design avoids communication failures if e.g. the line is
damaged or opened at a particular point. To further increase the
availability, it is also possible to distribute the communication
over two redundant rings. Each PCS 7 station is connected to
one of two Industrial Ethernet ports on each of the two separate
rings. The SIMATIC NET SOFTNET-IE RNA communication soft-
ware on the PCS
7 stations organizes communication processes
based on the PRP. Non PRP-enabled devices that have only one
Industrial Ethernet port, such as SICLOCK TC 400, can be inte-
grated in the redundant terminal bus via SCALANCE X204RNA.
The
Parallel Redundancy Protocol (PRP)
according to
IEC 62439-3 is based on double transmission of message
frames over two separate networks (Ring 1, Ring 2). At the
sender, the SOFTNET-IE RNA software or the SCALANCE X-
200RNA network access point duplicates the message frame ar-
riving from the sender and feeds one message frame to Ring 1
and the other to Ring 2. At the receiver, the software or the net-
work access point forwards the first incoming message frame to
the recipient. The second message frame from the second LAN
is discarded. Transmission of the message frame is thus always
ensured without delay if an error occurs.
Enterprise Level
Control Level
Field Level
Engineering
station
Mobile client
OS
client
Industrial Ethernet, terminal bus,
single/redundant
OS/Batch/Route
Control/Maintenance clients
Back Firewall
OS
server
Batch-
server
OS
server
Standard
automation
systems
Fault tolerant
automation
systems
Safety related
automation
systems
Industrial Ethernet, plant bus, redundant
Standard
automation
systems
Secure remote
access
PROFINET
PROFINET
PROFIBUS
Industrial
Wireless LAN
SCALANCE
XR-500
SCALANCE
XR-500
SCALANCE XR-500
SCALANCE
XM-400
SCALANCE
XM-400
SCALANCE
XM-400
SCALANCE
XM-400
G_IK10_XX_10395
SCALANCE
XM-400
SCALANCE
S627-2M
SCALANCE XR-500
© Siemens AG 2017