User guide

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Error! Unknown switch argument., AutroSafe Interactive Fire Alarm System, Release 3, P-ASAFE-LV/FE, Rev. A, 033105,
Autronica Fire and Security AS
Page 21
6.3 Ex. 3: Inadequate Interpretation of Loop Topology
In certain situations, The LoopViewer may not give a totally correct
presentation of the loop topology. Several factors may affect the
interpretation of the loop topology, for example, whether a point
belongs to the main loop or a branch-off, which point is registered first
during power up, if there is an illegal branch-off, etc.
In this example, the LoopViewer informs you that there is one multiple
branch-off, and that there is a break in the loop wire. Note that this is
actually not the fact, but a result of how the program may interpret the
loop in such a situation.
When more than one point powers up at the same time, the
LoopViewer has to guess which one belongs to the ‘main loop’, and
which one is a branch off.
If the LoopViewer comes to a break in the loop wire, it will swap the
last assumption (main loop and branch-off), and continue. But if the
LoopViewer makes a bad guess, and the branch chosen to be the
main loop contains a new branch-off (illegal), the LoopViewer has
problems.
Then the last assumption is verified to be true, and the topology
presented will be difficult to understand. The presentation is not
wrong, but it may be very inadequate.
In the example above, the LoopViewer guesses that LSI-2 is on the
main loop, and LSI-1.1 is the branch off. This is actually not true, LSI-
1.1 is the main loop.