SMAR DC302, Owner'S Operation And Maintenance Manual

Page: 13 / 49

Installation
1.5
WARNING
HAZARDOUS AREAS
In hazardous zones with intrinsically safe or non-incendive requirements, the circuit entity
parameters and applicable installation procedures must be observed.
Cable access to wiring connections is obtained by the two conduit outlets. Conduit threads
should be sealed by means of code-approved sealing methods.
Topology and Network Configuration
Bus topology (See Figure 1.7 - Bus Topology) and tree topology (See Figure 1.8 - Tree Topology)
are supported. Both types have a trunk cable with two terminations. The devices are connected to
the trunk via spurs. The spurs may be integrated in the device giving zero spur length. A spur may
connect more than one device, depending on the length. Active couplers may be used to extend
spur length.
Active repeaters may be used to extend the trunk length.
The total cable length, including spurs, between any two devices in the Fieldbus should not exceed
1900m.
The connection of couplers should be kept less than 15 per 250m.
WARNING
Power Supplies
If there are requirements for power supply isolation between inputs and outputs, it is
recommended to use at least two power supplies, one for inputs and another one for outputs
and VDC.
If the application does not require isolation between inputs and outputs, only one power supply
could be used for inputs, outputs and VDC.
Inputs and outputs are optically isolated from each other.
Terminator
Spur
Spur Spur
Shield
Junction
Box
TERMINATOR
ENABLED
+
+
PS302
FAIL
smar
ON
PS302
FAIL 1
FAIL 2
FAIL 3
FAIL 4
smar
ON
smar
FUSE
2,5A
P
S
I3
0
2
3
.0
(
P
o
w
e
r
S
u
p
p
ly
I
m
p
e
d
a
n
c
e
)
1A
2A
3A
4A
IN
24VDC
BT
OUT 1
Fieldbus H1
OUT 2
Fieldbus H1
OUT 3
Fieldbus H1
OUT 4
Fieldbus H1
5A
6A
7A
8A
9A
10A
+
Figure 1.7 - Bus Topology