Profibus Cable Lengths; Rules For Routing Profibus Cables; Table 5-7 Permitted Cable Length Of A Subnet Segment For Specific Baud Rates - Siemens SIMOTION D410 Manual

Connecting
5.9 Connecting the PROFIBUS DP interface (410 DP only)
Connector features
The bus connector is used to connect the PROFIBUS cable to the PROFIBUS DP interface
(X21), which is how you establish the connection to additional nodes.
You will find an overview of the bus connectors available for order in chapter "Spare parts
and accessories".
5.9.3

PROFIBUS cable lengths

Cable lengths and baud rate
The baud rate determines the cable length of a subnet segment.
Table 5-7
Baud rate
19.6 to 187.5 Kbits/s
500 Kbits/s
1.5 Mbits/s
3 to 12 Mbit/s
With isolated interface
1)
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. Please note that these maximum cable lengths
only apply if there is no further node interconnected between the two RS 485 repeaters. 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.
5.9.4

Rules for routing PROFIBUS cables

Routing bus cables
When routing the PROFIBUS cable, you must avoid:
• Twisting
• Stretching
• Squeezing
56
Permitted cable length of a subnet segment for specific baud rates
Max. cable length of a segment (in m)
1000
1)
400
200
100
D410
Manual, 03/2007 Edition