Bosch Addressable Output Interface Modules

• 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