Danger Levels - Siemens FDOOT221 Technical Manual

3.4.2
Building Technologies
Fire Safety

Danger levels

The detector's signal processing efficiently distinguishes between fire events and
deceptive phenomena. The basis for reaching a danger level is not only given by
measured values exceeding a "response threshold"; moreover, the smoke density
progression is observed over a longer period of time and assessed by the
algorithms.
Fire detectors can transmit the following danger levels* to the control panel:
Danger level Meaning
0 No danger
1 Check the situation
2 Warning
3 Alarm
* On a SIGMALOOP line, it is the sensor values, not the danger levels, that are
transmitted to the control panel.
Notes
The evaluation of the danger level and the decisions to be taken (e.g. activation
of remote transmission) are configured in the control panel.
On a collective line only the danger levels 0 and 3 can be transmitted to the
control panel.
Structure and function
Function
Comment
Normal condition
A different parameter set should
potentially be selected (inappropriate
application)
Possible danger
Fire
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01.07.2012