Inputs
39
Siemens Building Technologies
Fire Safety & Security Products
07.2009
5. Fire Alarm
The “Fire Alarm” mode must be used in combination with the “Fire Alarm” input type. If this
mode is not used with the fire alarm input type, a line break is not evaluated.
The input is operated using a 4.7 k
Ω
terminating resistor. The input is monitored for alarm and
fault. In the event of a short-circuit and alarm is triggered and in the event of a line break a
fault is triggered. The input is in the normal state if a resistance of 4.7 k
Ω
is present at the
input. The input must be triggered for at least 2 seconds for an alarm to be triggered.
Input in normal state = 4.7 k
Ω
(1R)
Input triggered = short-circuit
Input fault = line break
Positively in normal state from 3.6 k
Ω
(4.5 V)* to 6.2 k
Ω
(6.2 V)*
Positively triggered at < 3.3 k
Ω
(4.2 V)*
Positive fault present at > 6.6 k
Ω
(6.4 V)*
To reset storing smoke sensors, the negative of the sensor supply must be switched via an
output. To do this, the output “Latching Sensor Reset” must be programmed as a reset for
storing sensors in the “False” mode (always negative except on reset).
*The voltage values apply for a mains power supply of 13V
6. Glass Break Sensor
The glass break sensor mode requires a higher current. For this reason glass break sensors
can only be operated on inputs which can be switched to the glass break sensor via the mode
switches. These switches must be closed for the glass break sensor mode. For all other
types, the particular mode switches must be open.
This mode is to be used only for operation with electronic glass break sensors in a Z circuit.
To do this, the corresponding switch on the board must be closed.
To reset the glass break sensor, the negative of the input must be switched via one of the
“open collector” outputs to negative. For this, the output “Latching Sensor Reset” must be
programmed as a reset for storing sensors in the “False” mode (always negative except on
reset) (refer also to outputs.
For the physical input type „Glass break detector“you have close the hook switches on the
control panel or transponders.
The reason is to increase the voltage on the physical line up to ~8 Volt. Now there is a less
power flown by activation of the detectors LED‘s. But there is a limitation of max. 6 glass
break detectors.
7. Emergency Exit
The function of this mode is the same as the mode with two terminating resistors.
A short circuit of the input will reset the corresponding output.
8. Radio Alarm
This mode must be selected if the input is operated via a radio receiver.
6.5 Partition
[TM51] Partition Number Every Input belongs to partition number (1 to 6 for SI220, 1 to 2 for SI120).
6.6 Bypassable
Inputs which can be
Bypassed
Certain inputs can be bypassed by the user (with a suitable authorization) from the user menu for a setting
cycle (e.g. in the event of a faulty sensor). An automatic bypassing of triggered inputs is performed during
forced setting.. To make sure that an input can definitely be bypassed in these cases, the following condi-
tions must be met.
z
The input type must by reasons of its function be bypassable (see overview table).
z
The "Input Bypassable" option must be enabled during the programming of the input.
Input can be Bypassed
If this parameter is chosen, the inputs can be bypassed in the manner described above.
Input can not be By-
passed
If this parameter is chosen, the inputs can not be bypassed.
Summary of Contents for SI120
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