Connecting
7.8 PROFIBUS / MPI
NCU 7x0.2
Manual, 02/2011, 6FC5397-0AP20-0BA0
69
Supplementary conditions
During laying of the indoor bus cable, you must also consider the following supplementary
conditions (d
O
= outer diameter of the cable):
Table 7- 21 Supplementary conditions for the laying of PROFIBUS cables
Features Supplementary conditions
Bending radius for a single bend 80 mm (10xd
O
)
Bending radius (multiple times) 160 mm (20xd
O
)
Permissible temperature range for cable routing -5 °C to +50°C
Temperature range for storage and stationary operation -30°C to +65°C
Additional references
For length codes of prefabricated cables and additional information on PROFIBUS cables,
refer to "Electrical networks" in the PROFIBUS section of the IK PI catalog titled "Industrial
Communication and Field Devices".
7.8.5 Connecting PROFIBUS DP
Introduction
PROFIBUS cables are connected to the X126/X136 interface by means of a bus connector.
Wiring the bus connector
1. Proceed as follows to connect the bus connector:
2. Plug the bus connector into the corresponding interface on the control unit.
3. Screw the bus connector into place.
As the control unit is located at the start or end of a segment, you must switch on the
terminating resistor ("ON" switch setting).
7HUPLQDWLQJUHVLVWRU
VZLWFKHGRQ
7HUPLQDWLQJUHVLVWRU
VZLWFKHGRII
RQ
RII
RQ
RII
Figure 7-12 Terminating resistor switched on and off
Note
Make sure that the stations on which the terminating resistor is located are always
supplied with voltage during booting and operation.
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