SCALANCE network components
4.5 SCALANCE X Industrial Ethernet Switches
Industrial Ethernet
System Manual, 09/2019, C79000-G8976-C242-10
137
4.5.3 Functions of SCALANCE X devices
This section describes certain functions of SCALANCE X devices. For further information on
all the functions, refer to the compact operating instructions of the devices or the
configuration manual.
Signaling contact
The signaling contact is connected to a 2-pin plug-in terminal block. The signaling contact
(optical relay contact) is a floating switch with which error/fault states can be signaled by
breaking the contact.
The following errors/faults are signaled by the signaling contact:
● The dropping out of a link at a monitored port.
● The failure of one of the two redundant power supplies.
The connection or disconnection of a communication node at an unmonitored port does not
result in an error message.
The signaling contact remains activated until the error/fault is eliminated or until the current
status is applied as the new desired status using the button or by Web Based Management.
When the device is turned off, the signaling contact is always activated (open).
Support of virtual networks (VLAN)
There is no physical difference between a virtual network (VLAN) and a normal LAN. The
particular feature of a VLAN is that devices can be assigned to a device group during
configuration. Several of these device groups use a network infrastructure that exists only
once physically. This results in several "virtual" networks in the network that exists only once
physically. The data exchange and even the transmission of broadcasts takes place only
within a VLAN.
You can configure VLANs on the device or using GVRP frames.
MAC Address List
If this function is activated for a port, the device only forwards frames received at this port if
their source address exists in the address table.
SCALANCE devices log the information about which MAC address can be reached over
which port in a learning table. Entries in this list are deleted automatically when there is no
further data transfer for the corresponding MAC addresses. The time after which addresses
are deleted if there is no data traffic is set in the 'Aging Time' parameter.
The learning table indicates the Ethernet interface on which a MAC address can be reached.
The MAC address list can be based on the port or MAC addresses.
Network access protection complying with the IEEE 802.1X standard
Ports can be configured for end devices that support authentication according to IEEE
802.1X. The authentication is via a RADIUS server.
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