Appendix - Siemens 6GK1970–5CA20–0AA2 Instructions De Montage

6ZB5530–3AC30–0BA1
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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
(f →100 kHz)
(3 to 20 MHz)
<30 pF/m <60 pF/m
<110 Ohms/km –
→0.64 mm →0.53 mm
→0.34 mm →0.22 mm
2
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Infrared Link Modul (ILM)
2
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