Siemens siprotec 7SA6 User Manual page 60

Hardware and Connections
Connections to
Electrical
Communication
Interfaces
2-32
Channel C Channel B
Channel E Channel D
Figure 2-29 Inclined housing with 9-pin DSUB socket
Standard 9-pin D-subminiature plug connectors per MIL–C–24308 and DIN 41652
can be used.
The necessary communication cables are dependent on the type of interface:
• RS232/EIA232: Five-wire, twisted and shielded, e.g. interface cable 7XV5100–4.
• RS485/EIA485: Three-wire, twisted and shielded.
• Profibus: Two-wire or four-wire, twisted and shielded:
Wire type A, DIN 19245, part 2 and EN 50170 vol. 2, twisted and shielded,
Wire Resistance: 135 Ω to 165 Ω (f > 100 kHz)
Capacitance: < 30 nF/km (48 nF/mile)
Circuit resistance: < 110 Ω/km (177 Ω/mile)
Conductor diameter: > 0.64 mm
Conductor cross-sectional area: > 0.34 mm
e.g., SINEC L2 Industrial twisted pair installation wire
(see catalogue 1K 10 "SIMATIC NET, Industrial Communications Networks").
Channel C Channel B
Channel E Channel D
Plastic Plugs
2
C53000-G1176-C133-1
7SA6 Manual