B&B Electronics GW-7553 - Manual - Manual (Page 10)

GW-7553 PROFIBUS/Modbus TCP Gateway User Manual (Version 1.00, Dec/2008) PAGE: 10
Figure 5 Ethernet connection
2.3.3 PROFIBUS Connection
The PROFIBUS interface of the GW-7553 is a DB9 female connector. The
connector uses the standard PROFIBUS 9 pin assignment. It is recommended to
use a standard PROFIBUS cable and connector (DB9 male). As with every
serial bus the rate of safe data transmission in a PROFIBUS network decreases
with increasing distance between Master and Slave. Table 6 shows the
transmission rate and range for a cable with the following properties:
1. Impedance :135~165 Ω
2. Capacity : lower than 30 pF/m
3. Loop resistance : lower than 110 Ω/km
4. Wire diameter : greater than 0.65 mm
5.
Core cross-section : greater than 0.34 mm 2
Table 6 Transmission rate decreasing with increasing transmission distance
Transmission Rate(kbps) Transmission Distance per Segment (meter)
9.6, 19.2, 45.45,93.75 1200
187.5 1000
500 400
1500 200
3000, 6000, 12000 100