6.9.3 PROFIBUS cable lengths
Cable lengths and baud rate
The baud rate determines the cable length of a subnet segment.
Table 6-8 Permitted cable length of a subnet segment for specific baud rates
Baud rate Max. cable length of a segment (in m)
19.6 to 187.5 Kbits/s 1,000
1)
500 Kbits/s 400
1.5 Mbits/s 200
3 to 12 Mbit/s 100
1)
With isolated interface
Greater cable lengths
If
you must realize greater cable lengths than permitted in one segment, you must use RS 485
repeaters. The maximum possible cable lengths between two RS 485 repeaters correspond
to the cable length of a segment. You can connect up to nine RS 485 repeaters in a series.
Note that an RS 485 repeater must be counted as a subnet node when determining the total
number of nodes to be connected. This is true even if the RS 485 repeater is not assigned its
own PROFIBUS address.
6.9.4 Rules for routing PROFIBUS cables
Routing bus cables
When routing the PROFIBUS cable, you must avoid:
● Twisting
● Stretching
● Squeezing
Boundary conditions
You must pay attention to the following boundary conditions when routing the bus cable for
indoor use (dA = external cable diameter):
Table 6-9 Boundary conditions for routing of PROFIBUS cables
Features Boundary conditions
Bending radius for a single bend 80 mm (10 x dA)
Bending radius for multiple bends 160 mm (20 x dA)
Connecting
6.9 Connecting the PROFIBUS DP interface (410 DP only)
SIMOTION D410
Manual, 04/2014 79
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