ABB NPBA-12, Installation And Startup Manual

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Chapter 4 – Electrical Installation
4-4 NPBA-12 Installation and Start-up Guide
PROFIBUS Wiring
Examples
The PROFIBUS cable shield may be directly earthed at one station
only. At other stations the cable shield should be earthed via an
RC filter.
There are two wiring examples below for standard PROFIBUS cable
consisting of a twisted pair and screen.
Figure 4-3 Connection diagram for the standard PROFIBUS cable. Only connection (B) enables the
removal of the intermediate module without disturbing the bus.
A
B
PROFIBUS NPBA-12
X1 1 2 3 4
MASTER
B
A
X1
A B A B
NPBA-12
1 2 3 4
A B A B
5 6 7 8
+2
4V
0V
DG
SH
5 6 7 8
+2
4V
0V
DG
SH
GND
PROFIBUS NPBA-12
X1 1 2 3 4
MASTER
B
A
X1
A B A B
NPBA-12
1 2 3 4
A B A B
5 6 7 8
+2
4V
0V
DG
SH
5 6 7 8
+2
4V
0V
DG
SH
GND
X2 X2
X2 X2