Installation 3
Man-1161IN Rev.A
Taktis Vision Installation & Operation Manual
12
Wiring Scheme
The diagram below shows an example network wiring scheme featuring two FACP’s and two Annunciators.
Figure 3-11
Example Network Wiring
1.
Cabling wired as a ring which visits all panels.
2.
Short circuit detection at each network connection and automatic isolation of the shorted section of
cable.
3.
1200 metres maximum cable length between two adjacent segments.
4.
A short circuit at point A will automatically disconnect the shorted section and announce a fault condi-
tion at all panels but the entire network will continue communicating.
5.
A short circuit at points A and B will automatically disconnect both sections and announce faults at all
panels Communication will continue between panels1 and 4 and between panels 2 and 3.
6.
All panels will compute whether the faults will prevent operation of any cause and effects configura-
tions and either assume inputs to be true (if configured to default to "true upon network fault") or dis-
play, print (FACP fitted with optional prand log the cause and effects which are affected.
7.
Open circuit faults will allow the network to continue operating in the same way as short circuit faults.
8.
Open circuit faults will allow the network to continue operating in the same way as short circuit faults.
9.
Up to 128 nodes (in total).
Cable Length
The network communications protocol has been designed to be extremely tolerant to interference and data corrup-
tion, however as with any system, there have to be limitations set to guarantee correct operation.
The specified transmission distance limit for the communications method used is 1200 metres and because the data
is re-transmitted at each network card and repeater, in theory, there can be 1200 metres between each point if re-
quired.
Using the above cable distances however, does not take into account the failure of a network point to communicate
with the system through total power failure or other fault.
In this situation, the network pointy would disconnect itself from the network and connect the network cable such
that it bypasses the point in question. This means that the total cable length between the points either side of the
disconnected one could be 2400 metres, which is outside of the specification for the communications method used.
This fault scenario could clearly be extended to more network points and this would add 1200 metres of cable length
in each case.
A sensible fault tolerance limit has therefore to be suggested to enable the performance of the system to be predict-
ed.
B
A
NETWORK
ANNUNCIATOR
NODE 4
NETWORK
ANNUNCIATOR
NODE 3
NETWORK
FACP
NODE 2
1.2 KILOMETERS MAX
NETWORK
FACP
NODE1
-
+
-
+
+ -
+ -
+ -
-
+
+ -
+ -
Summary of Contents for Taktis Vision
Page 20: ......
