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 22
Normally, the LoopViewer will find out that it has made a mistake, and
switch the last guess made. In this example, however, the LoopViewer
meets a branch after LSI-2, and since a branch in a branch-off is
illegal, it assumes that this is still on the main loop, and that the last
guess (LSI-2) was correct. But as it can’t find more points on what it
thinks is the main loop, it assumes the loop has a break at this point.
So because of the illegal branch LSI-2.1, the LoopViewer is mislead to
believe it is still on the main loop.
As the assumed branch 1.1 is powered up, two points get powered up
at the same time at the end of the branch. This is illegal (no branch-off
in branch-off’s), so the LoopViewer has to place a warning symbol
there, and stop presenting the rest of the branch.
The two points where actually the last point in what should have been
the main loop, and the ‘IN’ side of the loop driver (closed loop).
Below, the correct topology is presented, as the LoopViewer would
have presented it if it hadn’t guessed wrong in the case of LSI-2, or if
the illegal multiple branch-off didn’t affect the presentation.