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Increase the maximum cable length between TLON segments.
Reduce unnecessary communications traffic on the respective network links.
Improve efficiency of the communications channel.
Up to 6 control panels can be connected to one channel i.e. one segment.
When the TLON is divided into more than one segment, the short circuit will affect the
communication between the Control Units in this segment only, the communication
between Control Units in other segments are not affected. The fault messages will be
generated in every Control Unit. However In a redundant system, the network will continue
to communicate via the second TLON network.
Dividing the TLON network into segments may assist in fault finding, faults on the network
e.g. disturbances etc., will be easier to locate and service.
Note: In retrofit network application where the cable integrity is uncertain, routers may
also be required to improve the communications between the TLON segments.
The recommended TP/FT10 router is LPR10, Brooks stock number FTG3 ROUTER. It is
also recommended to use the DIN rail mounting plate, stock number FTG3 ROUT PLATE.
3.4
Network connections
The communications between control panels in a network system can be established using
one of the three following options:
3.4.1
Twisted pair TLON network
The twisted pair cable connection between control panels and cable specifications are
shown in drawings F738-01, F738-02 and F738-03.
The recommended cable is twisted pair 1.5 mm², Brooks stock number BCA0898 or
equivalent. 1 mm² Twisted pair cable can also be used depending on the distance between
the control panels. If a screened cable is used, the shield must be connected to the CIE
earth point.
3.4.2
Fibre optic TLON network
Third party TP/FT10 to fibre optic routers have become obsolete e.g. LRW112 series.
However LRW102 series repeaters are still available.
It is possible to connect a TP/FT10 channel to a fibre optic channel using a Fibre Optic to
TP/FT10 repeater.
A fibre optic network communications can be achieved by using fibre optic repeater e.g.
LRW102 in conjunction with a TP/FT10 router e.g. LPR10. This combination replaces the
fibre optic routers LRW112 series when more than 10 control panels connected in a TLON
network. Great care shall be taken during planning, installation and commissioning.
The fibre optic link offers an easy way to extend the distance between TLON network
segments using high speed back bone fibre optic network link. The maximum distance
between the fibre optic routers varies between 5 Km to 30 Km depending on the type of
fibre.
The fibre optic solution to network FT1020G3 control panels is shown in Figure 2 and
Figure 3 below. The LPR10 router must be used when the number of networked control
panels is more than 10 panels as shown in Figure 2.
Technical/Programming Manual
15
FT1020G3 Rev 2.2.1
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