SIEMENS
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Siemens IK PI · 2015
PROFINET/Industrial Ethernet
Industrial Ethernet Switches
SCALANCE X-300PoE managed
2
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Function
•
Support of Power over Ethernet (PoE) according to
IEEE 802.3at Type 1 (corresponds to IEEE 802.3af)
•
Increase of the network performance;
by filtering the data traffic on the basis of the Ethernet (MAC)
address of the data terminals, data traffic remains local;
only data intended for users of another subnetwork is
forwarded by the switch.
•
Simple network configuration and network expansion;
the switch saves the data received at the ports and forwards
it automatically to the destination address. The limitation of the
network expansion by collision detection (CSMA/CD
procedure) terminates at the port.
•
Limitation of the error propagation to the affected subnetwork;
the SCALANCE X-300 switches only forward data with a valid
checksum (CRC).
•
Integration of existing subnetworks with 10 Mbit/s into Fast
Ethernet networks with 100 Mbit/s;
at the twisted-pair ports, the SCALANCE X-300 switches
automatically recognize the conductor pairs for transmission
and reception (autocrossover), the data transfer rate of 10 or
100 or 1 000 Mbit/s, as well as full-duplex and half-duplex
mode (autonegotiation).
•
High-performance connection of SCALANCE X-300 switches
with 1 Gbit/s;
SCALANCE X-300 PoE switches have up to eight Gigabit
Ethernet ports for connecting the switches to each other or
with other Gigabit-Ethernet-enabled components (e.g.
SCALANCE X-400, X-500)
•
Integrated redundancy manager for constructing Fast
Ethernet and Gigabit Ethernet ring topologies with high-speed
media redundancy.
•
High-speed standby redundancy;
several network segments such as rings can be intercon-
nected redundantly with SCALANCE X-300 by means of the
integrated standby function. Two X-300 switches are
configured in a ring as a master and slave and are connected
via two links to the other ring. The redundant link can be
implemented at 1 000 Mbit/s.
•
Redundant interfacing to higher-level networks;
SCALANCE X-300 switches support the standardized
redundancy procedures Spanning Tree Protocol (STP) and
Rapid Spanning Tree Protocol (RSTP). This enables a
subnetwork to be connected redundantly to a higher-level
network with reduced requirements for the reconfiguration
time (in the order of seconds). By supporting the Multiple
Spanning Tree Protocol (MSTP), a network can also be split
into multiple sub-segments.
•
Support of virtual networks (VLAN);
for structuring Industrial Ethernet networks with a fast growing
number of users, a physically existing network can be divided
into several virtual networks.
•
Load limiting when multicast protocols (e.g. video trans-
mission) are used;
through learning the multicast sources and targets (IGMP
Snooping, IGMP Querier), SCALANCE X-300 switches can
also filter multicast data traffic and therefore limit the load in
the network.
•
Configuration of the ports for terminals that support authenti-
cation in accordance with IEEE 802.1x.
Authentication is by means of a RADIUS server that must be
configured appropriately and must be accessible via the
network.
•
Support of the DHCP Option 82, 66, 67 (Dynamic Host
Configuration Protocol);
this facilitates the IP address assignment of a terminal
depending on the connected switch port. The IP address is
assigned via a DHCP Server, which has to be configured
accordingly and must be able to be reached via the network.
•
Support of Access Control List (ACL);
if this function is activated for a port, the switch only forwards
message frames received at this port if their source address
is listed in the address table. All connected nodes can be
automatically entered in the ACL.
• Syslog;
Syslog compliant with RFC 3164 is used in the IP network for
transmitting short, unencrypted text messages via UDP. This
requires the use of a Syslog server that must be configured
appropriately and must be accessible via the network.
•
Time synchronization;
diagnostic messages (log table entries, e-mails) are time-
stamped. The local time is standardized throughout the
network by means of synchronization with a SICLOCK time
transmitter, SNTP or NTP server or via IEEE1588, thereby
simplifying the assignment of diagnostic messages of several
devices.
Network topology and network configuration
The SCALANCE X-300 Industrial Ethernet switches are typically
accommodated together with the nodes to be connected in one
control cabinet. Electrical and optical versions can be installed
together in star, line and ring topologies.
The following network structures and combinations of structures
can be implemented:
•
Fast Ethernet and Gigabit Ethernet rings with fast media
redundancy;
to increase network availability, as many as 50 X-200, X-300,
X-400 or X-500 switches can be cascaded in line can be
connected into a ring.
•
Several rings can be redundantly linked through the standby
function.
•
At the same time, SCALANCE X-300 supports redundant
connection of the ring structure to the corporate network with
Rapid Spanning Tree.
•
Star topology with SCALANCE X300PoE switches:
The SCALANCE X-308-2M PoE switch represents a neutral
point that can connect up to eight nodes or subnets with each
other electrically or optically.
When configuring the network, it is necessary to observe the
following boundary conditions:
•
Maximum line length between two modules for multi-mode
fiber-optic conductors:
- 750 m at 1 Gbit/s
- 5 km at 100 Mbit/s
•
Maximum line length between two modules for single-mode
fiber-optic conductors:
- 10 to 120 km at 1 Gbit/s
- 26 to 70 km at 100 Mbps
•
Maximum cable length of the TP cable between two
SCALANCE X switches:
- Max. 100 m at 10/100 Mbit/s with IE FC Cable 2x2 and
IE FC RJ45 Plug 180
- Max. 100 m at 1 Gbit/s with IE FC Standard Cable 4x2
(90 m), IE FC RJ45 Modular Outlet and patch cable (10 m)
- Max. 10 m using patches with TP cord
© Siemens AG 2014