Common Properties Of All Scalance Devices - Siemens SIMATIC NET System Manual

Note
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4.3

Common properties of all SCALANCE devices

All SCALANCE devices have the following properties. If there are exceptions, these will be
pointed out in the description of the relevant device.
Autocrossover function
All SCALANCE devices have an integrated MDI/MDIX autocrossover function on their
electrical ports making it possible to use straight-through cables. This prevents malfunctions
resulting from mismatching send and receive lines. This makes installation much easier for
the user.
Autonegotiation
All SCALANCE devices also have the autonegotiation function. Autonegotiation means the
automatic detection of the functionality of the interface at the opposite end. Using
autonegotiation, repeaters or end devices can detect the functionality available at the
interface of a partner device allowing automatic configuration of different types of device.
With autonegotiation, two components connected to a link segment can exchange
parameters and with these parameters set themselves to the supported communication
functionality.
The SCALANCE devices are therefore plug-and-play devices that require no settings when
they are put into operation.
Please note the following:
● Devices not supporting the autonegotiation method must be set to half duplex.
● The port speed and duplex mode must be set identically on the connection partners
otherwise frames may be lost.
Fault mask
On all SCALANCE devices with a button on the front panel, it is possible to set a specific
configuration as the desired status (good status). Deviations from this setting occurring
during operation are treated as errors.
Monitored error statuses include, for example, the status of the power supply or link down to
a communications partner, to which the SCALANCE device reacts with a fault LED and by
opening the signaling contact.
Industrial Ethernet
System Manual, 09/2019, C79000-G8976-C242-10
SCALANCE network components
4.3 Common properties of all SCALANCE devices
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