FLM‑420/4‑CON Conventional Interface Modules 4‑wire LSN

FLM‑420/4‑CON Conventional Interface Modules 4‑wire LSN
  • Can be used with a wide range of conventional detectors
  • Monitoring of primary lines for alarms, short circuits and wire breaks
  • Conventional detectors can be connected in two stubs or one loop
  • Individual detector parameters can be programmed for each stub
  • Maintains LSN loop functions in the event of wire interruption or short-circuit thanks to two integrated isolators
  • Expanded system limiting values of LSN improved technology
  • Details
    LSN input voltage 15 V DC to 33 V DC (min. to max.)
    Max. current consumption from LSN 8.5 mA
    Primary line
    Line voltage 21 to 22 V DC (21.5 V DC typ. ±0.5 V DC))
    Max. current supply 2-wire sensor 6 mA
    Max. line current 80 mA per line (±10% at 25 °C)
    Max. line resistance 50 Ω per line (max. 2 x 25 Ω)
    Galvanic isolation from LSN Yes
    Input power supply (PWR IN)
    Voltage 24 to 30 V DC
    Residual ripple < 150 mV
    Output power supply 4‑wire detector (AUX)
    Voltage 23.5 V DC to 30 V DC(rated voltage 24 V DC)
    Residual ripple < 300 mV
    Max. current (supply to 4‑wire detector) 200 mA per output (can be switched in parallel)
    EOL resistor for stub wiring of conventional zone (class B)
    With calibration value 2.2 kΩ
    Without calibration value 2.2 kΩ / 3.9 kΩ
    Max. current consumption (PWR IN) 1 x 2.2kΩ* , 2 x 2.2kΩ* , 1 x 3.9kΩ* , 2 x 3.9kΩ*
    Standby 36 mA , 50 mA , 31 mA , 40 mA
    Lines open or short 25 mA , 28 mA , 25 mA , 28 mA
    1 device on alarm at the line (820 Ω alarm res.) 69 mA , 112 mA , 65 mA , 103 mA
    Multiple devices on alarm at the line 138 mA , 250 mA , 138 mA , 250 mA
    * number of zones used x EOL resistor applied on the zone(s)
    Additional current consumption (PWR IN)
    Safety buffer to consider.Only when 4-wire sensors are used and powered trough the power output (AUX 2+ 1/2 1+) of the FLM-420/4-CON. Add the following figures one time only to the total power consumption for each power supply output:
    no parallel switched 4-wire power output 325 mA
    with parallel switched 4-wire power output 650 mA
    Display element 1 red LED, flashes at 1 Hz in the event of an alarm
    Address setting 3 rotary switches
    Connections 12 screw terminals
    Permitted wire cross-section 0.6 to 3.3 mm2
    Housing material
    Surface-mounted housing ABS/PC blend
    Interface housing and adapter PPO (Noryl)
    Surface-mounted housing Signal white, RAL 9003
    Interface housing and adapter Off- white, similar to RAL 9002
    FLM-420/4-CON-S Approx. 126 x 126 x 71 mm (W x H x D)
    FLM-420/4-CON-D Approx. 110 x 110 x 48 mm (W x H x D)
    Weight Without / with packaging
    FLM-420/4-CON-S Approx. 390 g / 590 g
    FLM-420/4-CON-D Approx. 150 g / 350 g
    Permitted operating temperature -20 °C to +55 °C
    Permitted storage temperature -25 °C to +80 °C
    Permitted rel. humidity < 96% (non-condensing)
    Classes of equipment as per IEC 60950 Class III equipment
    Protection class as per IEC 60529
    FLM-420/4-CON-S IP 54
    FLM-420/4-CON-D IP 30




    LSN vds
  • Certificates (3)
    Title Type Language
    Declaration of Conformity PDF
    VdS PDF
  • Documents (6)

Product variants

FLM-420/4-CON-S Interface module conventional use, surf.

with 2 primary lines for 2- or 4-wire conventional detectors, with surface-mounted housing

Commercial Type No.: FLM-420/4-CON-S
Product No.: F.01U.012.534

FLM-420/4-CON-D Interface module conventional use, rail

with 2 primary lines for 2- or 4-wire conventional detectors, type DIN rail

Commercial Type No.: FLM-420/4-CON-D
Product No.: F.01U.012.535



FLM-IFB126-S Surface mount box

FLM-IFB126-S Surface mount box

as retainer for the interface modules series 420 type DIN rail (-D) or spare housing for type surface-mount (-S)

Commercial Type No.: FLM-IFB126-S
Product No.: F.01U.029.614