Siemens FS720 - Additional Criteria for Pre-Stage and Main Stage

'Detec
tion' task card
Configuring the 'Zone'
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Building Technologies
A6V10210424_j_en_
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Fire Safety
2018
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08
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29
3. Select 'Two-zone dependency' at the left in the window.
a The ↑ 'Detection tree' is depicted at the right of the window. The elements
that can be assigned are highlighted.
4. Select the second 'Zone' for the two-zone dependency.
5. Click on 'Assign'.
a The two 'Zones' are assigned to each other.
See also
2 Creating 'Detection tree' [➙ 141]
11.5.4 Additional criteria for pre-stage and main stage
Figure 57: Additional criteria for reaching the pre-stage or the main stage, respectively
In the detail editor of the 'Zone', you can define additional criteria for the settings
'Criteria PRE-STAGE' and 'Criteria MAIN STAGE' with the property 'Additional
criteria for PRE-/MAIN STAGE'. It can thus be ensured that 'PRE-STAGE' or 'MAIN
STAGE' will be reached with ↑ multi-detector dependency or two-zone
dependency, even in certain situations. The situations and settings are described
in the following sections.
Multi-detector dependency
● 'Fallback to single detector/zone dependency':
If the number of detectors is no longer sufficient in ↑ normal operation, a switch
is made to ↑ single-detector dependency in order to fulfill the multi-detector
dependency that has been set, e.g., in the event of a fault or when a detector
has been isolated. If this is the case, then 1 detector with ↑ danger level 2 or 3
is sufficient to trigger 'PRE-STAGE' or 'MAIN STAGE'.
The chronological order of the events is not relevant, i.e., a switch is made to
single-detector dependency with both of the following variants:
– First, danger level 2 or 3 is reached. Afterwards, the number of detectors
becomes less than required.
– First the number of detectors becomes less than required. Afterwards
danger level 2 or 3 is reached.
● 'TRVB S123: Danger level(s) + fault(s) and/or isolation(s)':
Faults and isolations of the detectors are evaluated in addition to the danger
levels as criteria for reaching 'PRE-STAGE' or 'MAIN STAGE', respectively.
When a danger level is reached and a fault and/or an isolation is reported in
addition, then 'PRE-STAGE' or 'MAIN STAGE', respectively, is reached.
The chronological order of the events is not relevant, i.e., 'PRE-STAGE' or
'MAIN STAGE' is reached with both of the following variants:
– First, a danger level is reached. Afterwards a fault and/or an isolation is
reported.
– First, a fault and/or an isolation is reported. Afterwards, a danger level is
reached.