Installing/Mounting
4.3 Connecting a CU240S DP or CU240S DP-F via PROFIBUS DP
Control Units CU240S
4-12 Operating Instructions, 11/2006, A5E00766042B AA
Maximum cable lengths
The PROFIBUS system can handle up to 126 stations. To run all these stations the
PROFIBUS system is divided into segments. All segments have to be connected via
repeater. The maximum number of stations on any segment must not exceed 32.
The maximum cable lengths are dependent on the baud rate (transmission speed). The
maximum cable lengths specified in the table below can be guaranteed only with PROFIBUS
bus cables (for example, Siemens PROFIBUS bus cable, order number 6XV1830-0EH10).
Table 4-3 Permissible cable length for one segment
Baud rate Max. cable lengths for one segment
9.6 kbaud … 187.5 kbaud 1000 m (3280 ft)*
500 kbaud 400 m (1312 ft)*
1.5 Mbaud 200 m (656 ft)*
3 Mbaud … 12 Mbaud 100 m (328 ft)*
∗ Repeaters can be installed to increase the length of a segment.
Cable installation rules
During installation the bus cable must not be:
● twisted
● stretched or
● compressed.
Supplementary constraints as regards electromagnetic compatibility must also be observed.
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