Siemens NCU 7x0.3 PN Series - Connecting PROFIBUS DP

Connecting
7.8 PROFIBUS DP
NCU 7x0.3 PN
66 Manual, 09/2011, 6FC5397-1EP40-0BA0
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).
7HUPLQDWLQJUHVLVWRU
VZLWFKHGRQ
7HUPLQDWLQJUHVLVWRU
VZLWFKHGRII
RQ
RII
RQ
RII
Figure 7-10 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.