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Ethernet via two-wire cabling for new and existing systems

01 June 2014

Siemens Industry has launched a new media module to enable the use of two-wire cabling for Ethernet communication, without the need for additional hardware such as modems.

The MM992-2VD media module permits the transfer of data across cabling, such as Profibus cables, of distances up to 1,000 metres.

The bandwidth depends on the length and quality of the cable however, bandwidths of 100 Mbit/s can generally be implemented at a distance of 500 metres, with cables of 1,000 metres incorporating bandwidths of 10 Mbit/s.

Cables are connected to the MM992-2VD via an RJ45 connector and the media module can be used with all modular switches in the Scalance X-300 range, as well as with the Scalance S627-2M security module.

Using MM992-2VD, existing cable infrastructure within machinery and plants is able to be converted to an Ethernet network quickly and economically. The solution represents an uncomplicated method of migrating to Profinet, particularly in view of the wide use of Profibus cabling.

In addition, the media module can be used within Ethernet networks to extend the maximum Ethernet cable length for bandwidths of 100 Mbit/s as defined in the standard. It enables the simple integration of remote network nodes into plant networks at distances of more than 100 and up to a maximum of 300 metres using standard copper cables instead of the glass fibre optic cables previously needed for such Ethernet connections.

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