Alarm Verification - Siemens FDCIO223 Technical Manual

Structure and function
3.4.1.4

Alarm verification

32
Building Technologies
Fire Safety
To help prevent false alarms, the FDCIO223 input/output module features a form of
alarm verification that can be activated as required.
When alarm verification is activated, any alarm (1) that occurs will first be stored by
the input/output module. Then the detector line will be reset and powered up again.
Once the detector line has finished powering up, the input/output module will
continue monitoring the detector line as normal (2). If the alarm recurs within t
(70 s), it will be forwarded to the control panel. Once the monitoring window of t
(4) has elapsed, any new instance of the alarm will be treated as if it were
occurring for the first time.
UL UL
1
Alarm verification
UL Detector line voltage
t Alarm response time
R
t Alarm verification time
V
The input/output module supports alarm response times (t
255 seconds.
To avoid false alarms, transfer to the control panel can be delayed by means of a
setting. In theory, a delay time of between 10 and 250 seconds can be set.
However, in practice the actual setting range will depend on the control panel and
the alarm response time. The permissible combinations should be selected when
configuring the system.
Comment
The permissible alarm response time may be limited by local regulations.
t
R
t
V
2 3
1 First alarm occurs
2 Time when the input/output module
starts monitoring the detector line again
3 If the alarm remains active, it is sent to
the control panel
4 End of monitoring window
V
V
t
4
) of between 0 and
R
009122_e1_en_--
2015-10-06