Field Bus Interface
The PROFIBUS DP connector (9-pin, female) has the following pin assignment:
| Pin |
Signal |
Description |
|---|
| 1 |
NC |
Not connected |
| 2 |
NC |
Not connected |
| 3 |
RxD/TxD-P |
Receive/Transmit positive |
| 4 |
CNTR-P |
Control signal for repeater, positive |
| 5 |
DGND |
Reference potential for data exchange and +5 Vl |
| 6 |
VP |
+5 V (power supply for the bus terminating resistors) |
| 7 |
NC |
Not connected |
| 8 |
RxD/TxD-N |
Receive/Transmit negative |
| 9 |
NC |
Not connected |
Correlation \ of baudrate, bit time and cable length:
| Baudrate in [kBit/s] |
Bit time [tBit] |
Max. cable length in [m] |
|---|
| 9.6 |
104.2 µs |
1200 |
| 19.2 |
52.1 µs |
1200 |
| 31.25 |
32 µs |
1200 |
| 45.45 |
22 µs |
1200 |
| 93.75 |
10.7 µs |
1200 |
| 187.5 |
5.3 µs |
1000 |
| 500 |
2 µs |
400 |
| 1500 |
666.7 ns |
200 |
| 3000 |
333.3 ns |
100 |
| 6000 |
166.7 ns |
100 |
| 12000 |
83.3 ns |
100 |
