6 connection examples, 1 one connected unit, Communication modules – Xylem 205547 Profibus Communication Modules User Manual
Page 16: Bgnd a plc, At bt
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2.6 Connection Examples
2.6.1 One Connected Unit
This example illustrates connection, termination and ID confi guration of a
single unit with a communication module and a PLC.
ID settings
205547 Profi bus Default ID = 99
Termination
Profi bus communication requires bus termination. If the PLC is terminated,
Unit #3 requires Connection between A to At, and B to Bt
If, on the other hand, the PLC is
NOT terminated, Unit #1 must also have
Connection between A to At, and B to Bt
B
GND
A
PLC
B
A
S
h
i
e
l
d
G
N
D
Lo
op
o
ut
L
oo
p
In
N
C
S
h
i
e
l
d
B
t
B
A
A
t
B
A
Shield
GND
Lo
op
o
ut
L
oo
p
In
NC
Shield
Bt
B
A
At
At
Bt
Communication Modules
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