Baud Rate and Maximum Cable Length
Available baud rates are 9.6 kbps, 19.2 kbps, 93.75 kbps, 187.5 kbps, 500 kbps, 1500 kbps, 3 Mbps, 6 Mbps, and 12 Mbps.
PROFIBUS DP requires approximately 1ms at 12 Mbps for transmission of 512 bits input data and 512 bits output data distributed over 32 stations. The following figure shows typical PROFIBUS DP transmission times depending on the number of stations and baud rate.
| Symbol | Description |
|---|---|
| a | Bus Cycle Time [ms] |
| b | Number of Slaves |
The maximum cable length is restricted by the baud rate.
| Baud Rates | Max. Cable Length |
|---|---|
| 12 Mbps | 100 m |
| 6 Mbps | 100 m |
| 3 Mbps | 100 m |
| 1500 kbps | 200 m |
| 500 kbps | 400 m |
| 187.5 kbps | 1000 m |
| 93.75 kbps | 1200 m |
| 19.2 kbps | 1200 m |
| 9.6 kbps | 1200 m |