Multi-Detector Dependency With Latching - Siemens FS720 Configuration

Template
'Multi, 2 det. dependency'
'Multi, 2 det. dependency II'
[AT]
'Multi, 2 det. dependency III'
[CH]

11.5.2 Multi-detector dependency with latching

Building Technologies
Fire Safety
'Multi, 2 det. dependency II' [AT]:
The checkbox 'Multi detector dependency with latching' is activated. The detectors
assigned to a 'Zone' are evaluated in a multi-detector dependency with the signal
being stored. If the 'Zone' reaches the pre-stage then the danger levels of the
detectors that have reached the criteria of the pre-stage are stored as a criterion
for the main stage. As soon as the required number of detectors have stored the
criteria for the main stage then the main stage is reached and signaled accordingly.
Example:
If a detector signals danger level 3, the 'Zone' reaches the pre-stage and a first
alarm is triggered. Danger level 3 of the detector is stored as the criterion for the
main stage. As soon as further detectors signal danger level 3, the zone 'Zone'
reaches the main stage and a second alarm is triggered.
Multi-detector dependency can be used for a moving fire, for example for detecting
a fire on a conveyor belt.
Standard settings
The table below shows the standard settings of the 'Automatic zone' in the 'Events'
tab of the detail editor.
Settings
Freely selectable
1 detector with ↑ danger level 3:
● Automatic first alarm
● ↑ Local alarming only (no delay times, internal sounder only)
2 detectors with danger level 3:
● Automatic fire alarm
● 'Manned operation': Delayed alarming
● 'Unmanned operation': ↑ Global alarming only
1 detector with danger level 3:
● Automatic first alarm
● 'Manned operation': Delayed alarming
● 'Unmanned operation': Global alarming only
2 detectors with danger level 3:
● Automatic fire alarm
● 'Manned operation' and 'Unmanned operation': Global alarming only
Table 13: Standard settings
The property 'Multi detector dependency with latching' in the detail editor of a
'Automatic zone' specifies whether ↑ multi-detector dependency with latching is
activated. If the property is activated, then the detectors of the 'Zone' are evaluated
as follows:
As soon as the 'Zone' reaches 'PRE-STAGE', the ↑ danger levels of the detectors
which fulfilled the criteria for 'PRE-STAGE' are latched. When the criteria set for
'MAIN STAGE' are fulfilled, the 'Zone' reaches 'MAIN STAGE'. This can be
triggered by the following events:
● Detectors with latched danger levels report a higher danger level.
AND/OR
● Other detectors report additional danger levels.
'Detection' task card
11
Configuring the 'Zone'
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A6V10210424_j_en_--
2018-08-29