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UMG 96RM-P/-CBM
Screening
Twisted screened cable should be used for connections
via the RS485 interface.
• Earth the screens of all cables that lead to
the cabinet, upon entering the cabinet.
• Connect the screens over a generous area and in a
manner that will conduct well, to a low-noise earth.
• Gather the cables mechanically above the earthing
clamp in order to avoid damage due to cable
movements.
• Use suitable cable glands to feed the cables
into the cabinet - for example armoured conduit
couplings.
Cable type
The cable used must be suitable for an environmental
temperature of at least 80°C.
Recommended cable types:
Unitronic Li2YCY(TP) 2x2x0.22 (from Lapp Kabel)
Unitronic BUS L2/FIP 1x2x0.64 (from Lapp Kabel)
Maximum cable length
1200m at a baud rate of 38.4k.
Transfer speeds
in Kbit/s
Max.
segment length
9.6; 19.2; 45.45; 93.75 1200m
187.5 1000m
500 400m
1500 200m
3000; 6000; 12000 100m
Table: Segment lengths per Profibus specification.
Cable
Strain relief
Screen braid of the cable
Earthing clamp
Low-noise earth
Fig. Screening procedure at cabinet entry.
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