• Dual Channel Monitoring: Tracks up to two independent external inputs for fans, valves, and flow switches.
• Triple Sensing Versatility: Program individual inputs for EOL line monitoring, dry contact tracking, or voltage signals.
• Compact In-Built Design: Fits neatly inside standard in-wall junction back boxes or directly within target equipment.
• Uninterrupted Loop Security: Features two integrated line isolators to preserve LSN bus communications during wire faults.
• Certified German Precision: Fully VdS Approved and EN 54-18 certified for enterprise commercial fire protection networks.
The Bosch FLM-420-I2-E Series Addressable Input interface module represents the absolute highest standard of European fire safety monitoring engineering. Engineered by Bosch in Germany and manufactured to strict quality parameters in China, the Bosch FLM-420-I2-E delivers uncompromising life-safety protection. This specialized Bosch FLM-420-I2-E in-built module is engineered to supervise external equipment like pumps, valves, fans, and flow switches in real time.
The space-saving, flush-mounting profile of the Bosch FLM-420-I2-E allows seamless integration directly behind standard switches or inside device housings. By leveraging two independent monitoring channels, the Bosch FLM-420-I2-E tracks critical facility status signals without requiring duplicate loop hardware.
| Model Assignment | FLM-420-I2-E (In-Built Dual Input Interface Module) |
| Manufacturer Brand | BOSCH Security and Safety Systems |
| Country of Origin | Germany (Engineered) / China (Manufactured) |
| Compliance Approvals | VdS Approved, CE Certified, CPD Certified, EN 54-17, EN 54-18 Compliant |
| System Interface Type | 2-Wire LSN Element (Local Security Network LSN Improved Line Infrastructure) |
| LSN Input Voltage Limits | 15 V DC to 33 V DC operating power parameters |
| LSN Current Draw | 10.4 mA maximum operational current consumption from the loop line |
| Monitoring Functions | EOL Line Resistance, Dry Potential-Free Contact, or Voltage Monitoring (0-30 V DC) |
| EOL Resistor Value | Nominal 3.9 kΩ end-of-line resistor configuration |
| Max Cable Length Input | Maximum 3 meters wire run distance permitted per individual input channel |
| Enclosure Build Material | Polycarbonate / ABS plastic blend, Signal White finish (Similar to RAL 9003) |
| Physical Core Dimensions | Approx. Ø 50 mm x 22 mm slim cylindrical flush dimensions |
| Box Mounting Compatibility | Mounts in standard electrical back boxes conforming to EN 60670 (Min depth 60 mm) |
| Environmental Boundaries | -20°C to +65°C operating parameters; Max 96% RH non-condensing moisture walls |
| Onboard Addressing System | 8 Integrated DIP switches supporting manual or automated software addressing |
Verify loop address allocations up to 254 elements, wire drop limits, and maximum 3-meter input line constraints before finalizing your Bosch FLM-420-I2-E module installation.
📥 Download Official Bosch FLM-420-I2-E Technical Submittal Datasheet
The core electronic advantage of integrating the comprehensive Bosch FLM-420-I2-E addressable input module is its adaptable input evaluation software layer. The dual-channel architecture of the Bosch FLM-420-I2-E allows each input to be programmed independently for EOL line monitoring, potential-free contact sensing, or direct DC voltage tracking. This allows the Bosch FLM-420-I2-E to deliver instant fault and alarm warnings to your central panel without false trigger interruptions.
Furthermore, the premium engineering of the Bosch FLM-420-I2-E delivers extensive layout flexibility across complex building projects. Installers can use the 8 onboard DIP switches on the Bosch FLM-420-I2-E board to establish manual node maps from address 1 to 254. Alternatively, keeping the DIP switches of the Bosch FLM-420-I2-E set to zero delegates full control to automated panel software routines.
To verify standard compliance profiles and secure reference validation links, browse the technical parameters on the main Bosch Security and Safety Systems Hub.
Q1: What is the main purpose of the Bosch FLM-420-I2-E input module?
A: The module connects and monitors up to two independent external devices—such as water flow switches, ventilation dampers, or pressure valves—to the fire panel.
Q2: What monitoring methods can be configured on the two inputs?
A: Each input can be configured via programming software for line monitoring with a 3.9 kΩ EOL resistor, dry potential-free contact monitoring, or 0–30 V DC voltage tracking.
Q3: How do technicians set the loop node address on the Bosch FLM-420-I2-E?
A: The module features 8 integrated DIP switches on its frame for manual address settings from 1 to 254, or position 0 for automated panel auto-addressing.
Q4: What happens if a short circuit occurs on the LSN communication loop?
A: Dual integrated isolators preserve full LSN loop functionality by isolating the damaged wire section and transmitting a fault report to the panel.
Q5: Can the flush-mount (-E) version be installed inside standard switch boxes?
A: Yes, it is specifically designed to be flush-mounted in standard device boxes matching EN 60670 with a recommended minimum box depth of 60 mm.
Q6: What is the maximum allowed cable length for the external monitored input lines?
A: Each input supports a maximum cable run distance of up to 3 meters between the interface module terminals and the external monitored device.
Q7: Is this input monitoring module certified for commercial life-safety applications?
A: Yes, the unit carries full VdS Approval and satisfies both European EN 54-17 (short-circuit isolators) and EN 54-18 (input/output devices) standards.
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