SINGLE MONITORED INPUT/OUTPUT UNIT – BN-304
Interactive fire detection systems
Product Datasheet
Features
• Interactive
• For interfacing and controlling external units to
Autronica’s interactive fire detection systems
• Multi function unit: Function selected by switch
setting.
• Input/Output signals
• 1 non-isolated input: on/off function with end-of-
line monitoring
• 1 output: Potential free contact without end-of-
line monitoring
• 1A 30 VDC dry relay contact for the output port
• Includes the SelfVerify function for reduced
maintenance/testing and increased reliability on
the input for critical alarm functions
• Short-circuit isolator of detection loop in each
unit
• Automatic addressing
• Proven technology
• Wall mounted
• Designed to meet the requirement of the major on this datasheet (Descriptions of function options A-K).
maritime classification societies The available functions include:
• Approved according to EN 54-17 and EN 54-18
• Function A
Alarm condition signalling input unit with relay feedback
Product overview • Function B
Pre Alarm condition signalling input unit with relay
The Single Monitored Input/Output Unit BN-304 has feedback
been designed for use with Autronica’s fire detection • Function C
Fault condition signalling input unit with relay feedback
systems Autroprime (version 1.1.0 or newer) and • Function D
AutroSafe (version 4.3.1 or newer), and includes the Uncommitted input unit (Output follows input)
SelfVerify function. This function ensures the highest • Function E
grade of reliability and reduces the need for manual Pre Alarm and Alarm condition signalling input unit with
testing because the panel is able to continuously configurable input delay and relay feedback
• Function F
and automatically check all units that include this Fault, Pre Alarm and Alarm condition signalling input
function. • Function G
Alarm condition signalling input unit with relay output used
Note: External devices attached to this interface unit for reset
require a separate power source (they can not be • Function H
Alarm condition signalling input and independent relay
powered by the detector loop). output function
SelfVerify: The unit’s ability to initiate alarm is • Function I
regularly checked. Uncommitted input unit and independent relay output
function
• Function J
Function options / Switch settings Relay output function (Input not in use)
The internal DIP switch S1 selects the function • Function K
performed by the BN 304 unit. For location of the Relay output function with activation feedback (input)
DIP switch, refer to circuit board drawing on the next
page. Refer to detailed descriptions of each function
116-P-BN304/CGB, Doc-1000372-1, 2021-02-16
Single Monitored Input/Output Unit – BN-304
Technical Specification
Dimensions (mm) 112 x 110 x 50
Weight (g) 192
Housing material Polyamide 6.6.
Colour Light grey
Mounting Wall mounting, 100 mm bolt space
Power Unit connects to AL_Com only
Voltage 16-26 VDC
Peak current consumption (during communication) 359μA
Average current consumption <60μA
Temperature range -25 to +70 °C
Humidity 10% - 95% RH (non-condensing)
Degree of protection
Membrane inlets: IP54
PG inlets (PG-13,5): IP67
Communication loop Autronica loop communication protocol (AL_Com)
Cable terminals Max 2.5 mm² single core wires
Cable requirements AL_Com Refer to specification for Autroprime or AutroSafe
Maximum input cable length 10 m
Maximum cable capacitance 10nF
Response time <= 1 second
Output relay rating 1A 30 VDC resistive load
Output relay type Dry contact, latching type; keep state on loss of power. No EOL
monitoring
Threshold Short circuit: 0-235 Ω
Activate: 260-1000 Ω
Normal: 1200-4800 Ω
Open circuit: 5400-∞ Ω
Approvals EN54, MED. For detailed info, see Autronica’s product web
http://product.autronicafire.com/products/
Product name Part number Description
BN-304 116-BN-304 Single monitored input/output unit
6571-011.6020 116-6571-011.6020 Membrane gland TSS M20, grey
Optional
6571-011.1920 116-6571-011.1920 Gland IP67
6531-006.1920 116-6531-006.1920 Backnut for gland
Autronica Fire and Security AS | www.autronicafire.com | Page 2
Single Monitored Input/Output Unit – BN-304
Dimension (mm)
Connectors
Terminal Description
1 AL_Com In (+)
2 AL_Com In (-)
3 AL_Com Out (+)
4 AL_Com Out (-)
5 Input (+)
6 Input (common)
7 Relay contact
8 Relay contact
Connectors and DIP switches on circuit board
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Single Monitored Input/Output Unit – BN-304
Descriptions of connection options
Input configuration A
Class 1
N.O.
2KOhm
910 Ohm
Input configuration B
Class 2
N.C.
2KOhm
910 Ohm
Input configuration C
Class 3
N.O.
2KOhm
Input configuration D
Class 4
N.C.
2KOhm
Figure 1
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Single Monitored Input/Output Unit – BN-304
The electrical connection options for the input to the unit are shown in Figure 1. The various electrical input
configurations allow a user to select under what condition the unit will be ‘triggered’ to provide a signal the fire
alarm system indicating the selected condition.
The four different behaviours can be configured by DIP switch 5 and 6 in order to be able to monitor different
setups of the input contact (s). (Switch 8 is not used).
(See location and dip switch no. on the circuit board drawing).
Input configuration A activates when the contacts are closed. This arrangement also allows the unit to monitor
for an electrical wiring fault in the form of an open or short-circuit, between the contacts and the unit, either
before or during activation.
S1.5 S1.6
OFF OFF
Normally Open contact with ‘activate’ resistor, fault monitored for open and short-circuit.
Input configuration B activates when the contacts are opened. This arrangement allows the unit to monitor for
an electrical wiring fault in the form of an open or short-circuit, between the contacts and the unit, either before
or during
S1.5 S1.6
OFF ON
Normally Closed contact with ‘activate’ resistor, fault monitored for open and short-circuit.
Input configuration C activates when the contacts are closed. This arrangement allows the unit to monitor for an
open circuit fault in the electrical wiring before activation. A short-circuit in the wiring will trigger the unit.
S1.5 S1.6
ON OFF
Normally Open contact without ‘activate’ resistor, fault monitored for open circuit.
Input configuration D activates when the contacts are opened. This arrangement allows the unit to monitor for
an open circuit fault in the electrical wiring during activation.
S1.5 S1.6
ON ON
Normally Closed contact without ‘activate’ resistor, fault monitored for open circuit.
Output configuration
The output relay can be set to Normal Open or Normal Closed operation by DIP switch 1.7:
• DIP 1.7 OFF = Normally Open
• DIP 1.7 ON = Normally Closed
DIP switch 1.8 determines the state of output if the unit loses its power.
• DIP 1.8 OFF = Relay remains in current state
• DIP 1.8 ON = Relay switches to initial state as chosen by DIP 1.7
Autronica Fire and Security AS | www.autronicafire.com | Page 5
Single Monitored Input/Output Unit – BN-304
Descriptions of function options
(See location of DIP switch S1 on the circuit board drawing)
Function A
S1.1 S1.2 S1.3 S1.4
OFF OFF OFF OFF
Function: Alarm condition signalling input unit with feedback function.
The relay contact will follow the state of the input.
Number of addresses: 1
Application include:
• Fire alarm push buttons
• Flame, heat or beam detectors with relay contacts
Function B
S1.1 S1.2 S1.3 S1.4
ON OFF OFF OFF
Function: Pre Alarm condition signalling input unit with feedback function.
The relay contact will follow the state of the input.
Number of addresses: 1
Application include:
• Manual input for Pre Alarm
• Pre Alarm input from a detector with relay output
• Sprinkler contacts, etc.
Function C
S1.1 S1.2 S1.3 S1.4
OFF ON OFF OFF
Function: Fault condition signalling input unit with feedback function.
Relay contact closes when the fault state is entered, and opens when the unit is reset.
Number of addresses: 1
Application include:
• Monitoring of associated equipment for faults
• Monitoring of detectors with relay contacts
Function D
S1.1 S1.2 S1.3 S1.4
ON ON OFF OFF
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Single Monitored Input/Output Unit – BN-304
Function: Uncommitted input.
Number of addresses: 1
Applications:
A typical application is monitoring of the power fault contact in the power supply or a fire pump. This unit can be
used for:
• Monitoring of water level detection systems
• Monitoring of smoke control damper systems
• Monitoring of extinguishing systems
• General Alarm Push Button (GAPB)
The relay contact will follow the state of the input.
Function E
S1.1 S1.2 S1.3 S1.4
OFF OFF ON OFF
Function: Delayed Alarm condition signalling input unit with feedback function. Input delay 2 seconds.
Configurable delays for entering Pre Alarm and Alarm condition. Default delays: Pre Alarm 10 seconds, Alarm 20
seconds (timers are configurable).
Relay contact closes when the alarm state is entered, and opens when the input goes to normal.
Number of addresses: 1
Application include:
• Sprinkler contacts, etc.
Function F
S1.1 S1.2 S1.3 S1.4
ON OFF ON OFF
Function: Fault, Pre Alarm and Alarm condition.
Number of addresses: 1
Applications include:
• Fire detectors with two-level output (Pre Alarm and Alarm).
Relay contact activates for a configurable period when the unit is reset. This provides a 5 seconds (configurable)
pulse for resetting the external detector.
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Single Monitored Input/Output Unit – BN-304
Function G
S1.1 S1.2 S1.3 S1.4
OFF ON ON OFF
Function: Alarm condition signaling input unit with reset function for external detector.
Relay contact activates for a configurable period when the unit is reset. This provides a 5 seconds (configurable)
pulse for resetting the external detector.
Number of addresses: 1
Applications include:
• Flame, heat or beam detectors with relay contacts.
Function H
S1.1 S1.2 S1.3 S1.4
ON ON ON OFF
Function: Alarm condition signalling input and independent relay output function.
Number of addresses: 2
Input application includes:
• Fire Alarm push buttons
• Flame, heat or beam detectors with relay contacts
• Sprinkler contacts, etc.
The output unit contains a potential free contact, which can be activated from a detector or a combination of
several detectors or other preconfigured cause and effect relationships. No end-of-line monitoring on output
function.
The output can be used for:
• Door release
• Sprinkler control/functions
• Control of fire dampers
• FPE/FAD without bell patterns
Autronica Fire and Security AS | www.autronicafire.com | Page 8
Single Monitored Input/Output Unit – BN-304
Function I
S1.1 S1.2 S1.3 S1.4
OFF OFF OFF ON
Function: Uncommitted input and independent relay output function.
Number of addresses: 2
Applications:
A typical application is monitoring of the power fault contact in the power supply or a fire pump. This unit can be
used for:
• Monitoring of water level detection systems
• Monitoring of smoke control damper systems
• Monitoring of extinguishing systems
The output unit contains a potential free contact, which can be activated from a detector or a combination of
several detectors or other preconfigured cause and effect relationships. No end-of-line monitoring on output
function.
The output can be used for:
• Door release
• Sprinkler control/functions
• Control of fire dampers
• FPE/FAD without bell patterns
Function J
S1.1 S1.2 S1.3 S1.4
ON OFF OFF ON
Function: Relay output function (input not in use)
Number of addresses: 1
Applications:
The output unit contains a potential free contact, which can be activated from a detector or a combination of
several detectors or other preconfigured cause and effect relationships. The output can be used for:
• Door release
• Sprinkler control/functions
• Control of fire dampers
• FPE/FAD without bell patterns
Function K
S1.1 S1.2 S1.3 S1.4
OFF ON OFF ON
Function: Relay output function with activation feedback monitoring. Default delay for change of position is 15
seconds. At activation there is a 30 seconds delay before a technical alarm is initiated if the door is not closed
within that timer. When the door closes an indication of this status is given immediately. When the door is
closed, an indication of the new status is sent after 120 seconds. All delays are configurable.
Number of addresses: 1
Applications:
• Door control and monitoring
• Fire damper control and monitoring
• Low location lights control and monitoring
• Other equipment
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