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5 Applications
5.1 Basic Applications
42
SICAM I/O Unit, 7XV5673, Device Manual
E50417-H1040-C484-A3, Edition 05.2012
5.1.4
I/O Expansion for the Connection to Systems Control or a Central Controller
(Optical)
If the SICAM I/O Units are used as I/O expansion, binary signals are exchanged between a device (systems
control with Modbus RTU) and the devices connected to the SICAM I/O Units. In case of cascading, up to 3
SICAM I/O Units can be connected to each mini star coupler 7XV5450 via fiber-optic cables (see Figure 5-4).
Without cascading, up to 4 SICAM I/O Units can be connected to a mini star coupler.
Figure 5-4
I/O Expansion for the Connection to Systems Control, Using Mini Star Couplers
Device
(System control with
Modbus RTU)
O
p
ti
c
a
l i
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te
rf
a
c
e
SICAM I/O Unit 1
Modbus server
Binary
inputs
Relay
outputs
Indication
from Remote
Binary
inputs
Relay
outputs
Indication
from Remote
SICAM I/O Unit 2
Modbus server
Mini star
coupler
7XV5450
Binary
inputs
Relay
outputs
Indication
from Remote
SICAM I/O Unit 3
Modbus server
Ca
s
c
a
d
in
g
optical interfaces of
the
SICAM
I/O Units
FO
FO
FO
FO
FO
FO
FO
FO for 820 nm:
2 Multimode FO 62.5
μ
m/125
μ
m
with ST plugs, max. 1.5 km
Mini star
coupler
7XV5450
Op
ti
c
a
l i
n
te
rf
a
c
e
O
p
ti
c
a
l i
n
te
rf
a
c
e
O
p
ti
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a
l i
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te
rf
a
c
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Ca
s
ca
d
in
g
MAN_SICAM_IO-Unit_7XV5673_US.book Page 42 Thursday, May 10, 2012 10:59 AM