Connecting
7.8 PROFIBUS DP
NCU 7x0.3 PN
Manual, 09/2011, 6FC5397-1EP40-0BA0
63
Position of connectors
The following figure shows the mounting position and designation of the connectors on the
Control Unit.
'303,
;;
'3
Figure 7-9 PROFIBUS DP/MPI interfaces
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 Cable specifications for X126 and X136
Characteristics Version
Connector type 9-pin SUB-D socket
Cable type PROFIBUS cable
Max. cable length 100 m for 12 Mbits
Table 7- 21 Technical data for PROFIBUS cables
Characteristics Values
Wave impedance Approximately 135 to 160 Ω (f = 3 to 20 MHz)
Loop resistance ≤ 115 Ω/km
Effective capacitance 30 nF/km
Damping 0.9 dB/100 m (f = 200 kHz)
Permissible conductor cross section 0.3 mm
2
to 0.5 mm
2
Permissible cable diameter 8 mm + 0.5 mm
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