Siemens SIMATIC NET PROFIBUS Owner's Manual page 393

6ZB5530–3AC30–0BA1
12 Appendix
Electrical parameters of the RS 485 LAN cables
You can use the following cables to attach an RS 485 bus segment and individual DTEs to the PROFIBUS ILM:
â
Cable Type A complying with PROFIBUS DP; (DIN 19 245 Part 2)
â
Cable Type B complying with DIN 19 245 Part 1; 04.91; Section 3.1.2.3
Remember the restricted distance and transmission rate possible with the Type B cable (according to Table 2).
Cable Parameters
Characteristic resistance
Capacitance per unit
length
Loop resistance
Core diameter
Core cross-section
Table 5: Electrical Parameters of the Shielded Twisted Pair LAN Cables
Type A Type B
135 to 165 ohms 100 to 130 ohms
(3 to 20 MHz) (f 100 kHz)
<30 pF/m <60 pF/m
<110 Ohms/km –
0.64 mm 0.53 mm
2
0.34 mm 0.22 mm
51
Infrared Link Modul (ILM)
2
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