Operating instructions

Industrial Ethernet SCALANCE X-100 and SCALANCE X-200 Product Line
Operating instructions, 09/2006, A5E00349864 Release 7
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Introduction
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1.1 Introduction
The devices of the SCALANCE X-100 are unmanaged Industrial Ethernet switches with up
to eight ports and on-site diagnostics for applications in the vicinity of the machinery.
The devices of the SCALANCE X-200 are managed Industrial Ethernet switches that can be
used universally for applications ranging from those in the vicinity of the machinery to
networked units. Configuration engineering and remote diagnostics are integrated in the
SIMATIC STEP 7 engineering tool increasing the plant availability. Devices with a high
degree of protection allow installation without a cabinet.
With the SCALANCE X-200 IRT switches (IRT = isochronous real time), SIMATIC NET
offers the first Industrial Ethernet real-time switches from the new SCALANCE series with
innovative housing concept and integrated ERTEC (Enhanced Real-Time Controller). By
using the "cut through" switching mechanism, the switches are ideal to meet the real-time
requirements of PROFINET.
What is possible?
The devices of the SCALANCE X-100 or SCALANCE X-200 product lines, allow the cost-
effective installation of Industrial Ethernet bus, star, or ring structures with switching
functionality.
By using the “cut through” switching mechanism, the SCALANCE X-200IRT switches are
ideal to meet the real-time requirements of PROFINET.
Cut through is not possible
• between a port set to 10 Mbps and a port set to 100 Mbps
• when two packets are to be sent at the same time on one port.
One particular advantage of the SCALANCE X-200IRT switches in PROFINET networks is
the integrated ERTEC. This gives priority to PROFINET packets when forwarding.
Note
It is not possible to use devices of the SCALANCE X-100 product line in a redundant ring
because they do not support redundancy.