100 kbit/s 600 m 25 m 120 m
125 kbit/s 500m 20 m 100 m
200 kbit/s 300m 13 m 70 m
250 kbit/s 250m 10 m 50 m
500 kbit/s 100m 5 m 25 m
800 kbit/s 50m 3 m 15 m
1 Mbit/s <20m 1 m 5 m
9.1.2 Connection of bus cable shield
It is not clear which is the right solution for connection of the bus cable shield because there
are different disturbances that can make influence on the system. In some cases with high
disturbances it can be necessary to test different solutions. The figure below shows two
alternatives.
Alternative 1 is the common solution giving a god protection against disturbances along the
cable but have the disadvantage in that current in the shield can appear and by noisy supply
voltage to Pluto it can also give problems.
Alternative 2 solves the problems with alternative 1 but does not give good protection against
high frequency disturbances.
If the Pluto units are mounted close to each other in the same cabinet the shield can be
omitted.
Both ends connected to earth
Cabinet Cabinet
Inside cabinet
(B42 AS-i: Connect to "CS" terminal)
* or CS terminal
* or CS terminal
K K K K K
IQ13 IQ15 IQ 17 0VID +24V
I4I0C L I2
C H I1 I3
I5 I7 IQ11 Q3
IQ10I6 Q2
* or CS terminal
Alternative 1
PLUTO
Q1Q0IQ16IQ14IQ12
IQ13 IQ15 IQ17 0VID +24V
I4I0C L I2
C H I1 I3
I5 I7 IQ11 Q3
IQ10I6 Q2Q2I6 IQ10
Q3
IQ11I7I5
I3I1C H
I2C L I0 I4
+24VID 0VIQ17IQ15IQ13
IQ12 IQ14 IQ 16 Q0 Q1
PLUTO
Alternative 2
and other end not connected
One end to earth (B42 AS-i: Connect to "CS" terminal)
Cabinet Cabinet
PLUTO
Q1Q0IQ16IQ14IQ12
Q2I6 I Q10
Q3
IQ11I7I5
I3I1C H
I2C L I0 I4
+24VI D 0VI Q17IQ 15IQ13
IQ12 IQ14 IQ 16 Q0 Q1
PLUTO PLUTO
Q1Q0IQ16IQ14IQ12
IQ13 IQ15 IQ 17 0VID +24V
I4I0C L I2
C H I1 I3
I5 I7 IQ11 Q3
IQ10I6 Q2
Alternatives for connection of bus cable shield
*For B42 AS-i and D45 connect shield to the ”CS” terminal
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