Honeywell FX808331

Product Name: ESSER FlexES Control Loop Card (ESSERBUS / ESSERBUS Plus Interface)
Product Introduction: A fire alarm system communication module produced under the ESSER by Honeywell brand, designed for the FlexES series intelligent fire detection panels. It manages one SLC (Signaling Line Circuit) loop connecting smoke detectors, manual call points, and I/O modules.

Category: Honeywell

Description

Technical Specifications:
- Operating Voltage: 24 V DC
- Quiescent Current: Approx. 17 mA
- Loop Capacity: Up to 127 addressable devices per loop
- Loop Length: Up to 3.5 km (depending on cable and topology)
- Protocols: ESSERBUS, ESSERBUS Plus (mixed operation supported)
- Dimensions: 27 × 93 × 112 mm (W×H×D)
- Weight: ~110 g
Functional Features:
- Galvanic Isolation (GI): Integrated line isolators (FX808332 variant explicitly has GI; FX808331 often referenced alongside it) protect the panel from short circuits on the field loop.
- Continuous Monitoring: Detects open circuits, shorts, and device removal in real time.
- Fast Recovery: Automatic reinitialization of loop-powered sounders after fault clearance per EN 54-13.
Material & Structure: Plastic protective housing with LED indicators for loop status (normal, short, fault); plugs into the motherboard of the FlexES control panel.
Application Scenarios: Addressable fire detection in commercial buildings, airports, industrial facilities, and infrastructure sites using ESSER Honeywell systems.
Working Principle: Polls each addressed device on the loop at regular intervals via digital protocol; analyzes response telegrams to determine alarm, fault, or normal status and reports to the main CPU.
Notes: If more than four loop cards are installed in a panel, galvanically isolated (GI) versions are mandatory from the fifth card onward to prevent cascade faults.

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