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4.2.10
MM992-2VD
Possible attachments
The MM992-2VD media module has the following:
● 2 x 10/100/1000 Mbps, RJ-45 ports electrical with securing collar
● Additional two-wire transfer function (variable distance) for establishing Ethernet
connections even using cables that do not conform to Ethernet. Possible distance covered
depends on the cable quality.
● If you use the two-wire transfer function, you need to connect the MM992-2VD media
module with a device that also supports the two-wire transfer function. Devices with the
suffix "VD" in the type designation support the two-wire transfer function. In addition,
observe the operating instructions for the VD device.
Figure 4-10
[Device labeling in square brackets]
NOTICE
Cable connection between VD devices
Use the same type of cable for the cable connection between two VD devices. Infrastructure
cables as well as any patch cables in use must be of the same cable type.
If the cable type between the two VD devices changes during the transmission path, signal
reflections can occur at the connection site of the different cables, which can result in frame
losses.
Note
For connection to electrical networks note the information in Appendix A.1 and A.2.
Pin assignment for the RJ-45 connector of a PROFIBUS cable
If you use a PROFIBUS cable along with an IE FC RJ-45 plug 4x2, note the following:
RJ-45 connectors
Pin assignment
1
2
SCALANCE MM900
Compact Operating Instructions, 11/2019, A5E02630805-16
MM992-2VD [9922VA]
Color
Yellow
Orange
4.2 Product properties and device views
PROFIBUS cable
Wire color
Green
Red
Device description
25
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