Siemens SIMATIC NET PROFIBUS Owner's Manual page 114

Passive Components for RS-485 Networks
Figure 4-8 Example of Using the PROFIBUS Trailing Cable in a Drag Chain
Segment Lengths
Due to the increased loop resistance, somewhat shorter segment lengths are
permitted at low transmission rates (see Table 3.1). At transmission rates
Kbps, the trailing cable has the same values as the standard LAN cable.
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PROFIBUS Networks SIMATIC NET
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