Brand: BOSCH
Country of Origin: GERMANY
Model: FLM-420
Features:
- Semi-conductor output electrically isolated from LSN
Loop and short-circuit proof
- Max. switchable current per output 700 mA
- Individually selectable input monitoring functions
(EOL or contact)
- Maintains LSN loop functions in the event of wire
interruption or short-circuit thanks to two integrated
isolators
Functions
Semi-conductor output
The semi-conductor output is electrically isolated from the
LSN loop and protected against short circuits.
Output power supply
The power supply for loads connected to the output can
be selected as:
• Auxiliary power supply from the fire panel
• External power supply units.
Input monitoring functions
The FLM‑420‑O1I1 Output-input-Interface Module
provides two monitoring functions:
1. Monitoring of a line by an EOL resistor
2. Monitoring of a potential‑free contact
The input monitoring functions can be selected by setting
the corresponding addresses.
Line monitoring with EOL resistor
The EOL resistor has a standard resistance of 3.9 kΩ.
The interface module detects
• Standby
• Triggering in the event of a short circuit
• Triggering in the event of line interruption.
Position Description
RΣ Overall line resistance with RΣ = RL/2 + RL/2 + REOL
RL/2 Line resistance
The following line conditions will be reliably detected if
the overall line resistance is within the specified range:
Line condition Overall line resistance RΣ
Standby 1500 Ω to 6000 Ω
Short circuit < 800 Ω
Interruption > 12.000 Ω
Contact monitoring
The interface module evaluates the operating conditions
"open" or "closed". The normal operating condition can be
programmed for each input. Contact monitoring has a
pulse intensity of 8 mA.
LSN features
Integrated isolators ensure that function is maintained in
the event of a short circuit or line interruption in the LSN
loop. A fault indication is sent to the fire panel.
Features of LSN improved version
The interface modules in the 420 series offer all the
features of improved LSN technology:
• Flexible network structures including T‑tapping
without additional elements
• Up to 254 LSN improved elements per loop or stub
line • Unshielded cable can be used
Interface variants
The Output-input Interface Modules are available in
various designs:
• FLM‑420‑O1I1‑E in-built version:
- Suitable for standard device boxes according to
EN 60670 and
- For a space-saving installation in all devices.
• FLM‑420‑O1I1‑D DIN-rail version:
- Suitable for installation on a DIN-rail according to
EN 60715 with included adapter and
- For the FLM‑IFB126‑S surface-mounted housing.
Technical Specifications
Electrical
LSN
• LSN input voltage 15 V DC to 33 V DC
• Max. current consumption
from LSN
1.9 mA
Output
• Max. switchable voltage of
semi-conductor output
30 V DC
• Max. switchable output
current
700 mA (depending on external power
supply)
• External power supply 5 V DC to 30 V DC
Input
Line monitoring with EOL
• EOL resistor Nominal 3.9 kΩ
• Overall line resistance RΣ
with RΣ = RL/1 + RL/
2 + REOL
• Standby: 1500 Ω to 6000 Ω
• Short circuit: < 800 Ω
• Line interruption: > 12.000 Ω
Contact monitoring
• Max. current strength
(current pulse)
8 mA
Minimum activation time of the
input
3.2 s
Mechanical
Connections
• FLM-420-O1I1-E 14 screw terminals
• FLM-420-O1I1-D 12 screw terminals
Permissible wire diameter
• FLM-420- O1I1-E 0.6 mm2 to 2.0 mm2
• FLM-420- O1I-D 0.6 mm2 to 3.3 mm2
Address setting
• FLM-420- O1I1-E 8 DIP switches
• FLM-420- O1I1-D 3 rotary switches
Housing material
• FLM-420- O1I1-E ABS/PC blend
• FLM-420- O1I1-D incl.
adapter
PPO (Noryl)
Housing color
• FLM-420- O1I1-E Signal white, RAL 9003
• FLM-420- O1I1-D incl.
adapter
Gray white, similar to RAL 9002
Dimensions
• FLM-420- O1I1-E Approx. 50 mm x 22 mm (Ø x H)
• FLM-420- O1I1-D incl.
adapter
Approx. 110 x 110 x 48 mm
(W x H x D)
Weight Without/with packing
• FLM-420- O1I1-E Approx. 35 g / 170 g
• FLM-420-O2-D Approx. 95 g / 390 g
Environmental conditions
Permissible operating temperature
-20 °C to +65 °C
Permissible storage temperature -25 °C to +80 °C
Permissible rel. humidity < 96% (non-condensing)
Classes of equipment as per
IEC 60950
Class III equipment
Protection class as per
IEC 60529
IP 30
System limiting values
Maximum cable length input 3 m
Maximum cable length output 3 m
