Profibus Cables And Connectors - Siemens NCU 7x0.3 PN Series Manual

Position of connectors
The following figure shows the mounting position and designation of the connectors on the
Control Unit.
Figure 7-9
7.8.2

PROFIBUS cables and connectors

Cable specifications
The PROFIBUS cable is 2-wire, twisted, and shielded with defined technical data.
Table 7- 20
Characteristics
Connector type
Cable type
Max. cable length
Table 7- 21
Characteristics
Wave impedance
Loop resistance
Effective capacitance
Damping
Permissible conductor cross section
Permissible cable diameter
NCU 7x0.3 PN
Manual, 09/2011, 6FC5397-1EP40-0BA0
PROFIBUS DP/MPI interfaces
Cable specifications for X126 and X136
Technical data for PROFIBUS cables
Version
9-pin SUB-D socket
PROFIBUS cable
100 m for 12 Mbits
Values
Approximately 135 to 160 Ω (f = 3 to 20 MHz)
≤ 115 Ω/km
30 nF/km
0.9 dB/100 m (f = 200 kHz)
0.3 mm to 0.5 mm
2 2
8 mm + 0.5 mm
Connecting
7.8 PROFIBUS DP
63