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B3920 Schneider System Controller BACnet 16 Sensor Inputs 8 Triac Outputs Expansion Bus Port Smart
The B3920 is a BACnet system controller from the Andover Continuum family, designed to operate between field equipment and the head end in building management systems. It features sixteen universal inputs and eight digital or analog outputs, plus a dedicated smart sensor input and expansion port for additional I/O. This configuration enables complete plant room control with a single device that can be expanded later without controller replacement.
The controller's point capacity is commercially significant, determining whether a project requires one panel or multiple units. With sixteen inputs, it can accommodate the typical mix of temperature sensors, status contacts, and flow switches found in small mechanical rooms. As a native BACnet device, it directly exposes objects to the network, supporting interoperability services for reading, trending, alarming, and scheduling without proprietary drivers.
| Attribute | Detail |
|---|---|
| Product type | BACnet system controller for building services |
| Order number | B3920 |
| Family | Andover Continuum b3 series |
| Universal inputs | Sixteen universal inputs for temperature sensors, contacts and analog signals |
| Outputs | Eight digital or analog outputs; relay contacts rated for 115/230 V AC circuits |
| Smart sensor input | One dedicated input for an Andover smart temperature sensor |
| Expansion | Expansion port for additional I/O modules |
| Communication | BACnet over the building network; MS/TP field bus support |
| Device profile | BACnet Advanced Application Controller with scheduling, trending and alarm services |
| Engineering | Programmed with the Andover Continuum engineering toolset |
| Mounting | Panel mounted inside a grounded enclosure |
| Typical duty | Plant room and mechanical services control with local logic execution |
| Compliance | CE marking; RoHS and REACH declarations held by Schneider Electric |
This controller level is designed to maintain operation when supervisory layers are unavailable. Control strategies should be written to maintain plant safety and functionality without network dependency.
Point allocation requires careful planning before wiring. While universal inputs are flexible, physical terminal layout must accommodate connected devices. Retrofitting incompatible sensor types is significantly more disruptive than proper initial planning.
When using the expansion port, treat additional I/O as part of the same engineering database rather than separate devices. This maintains consistent point naming and prevents conflicting plant descriptions. Application program backups should be created during commissioning and stored separately from the device.
- Mechanical Plant Rooms: Controls pumps, valves, temperature sensors, status contacts, and interlocks for commercial building installations
- Air Handling Systems: Manages heating/cooling coils, humidifiers, and variable speed drives with individual device monitoring
- Infrastructure Maintenance: Used in hospitals, universities, and government facilities maintaining existing Andover Continuum systems
- Critical Environments: Applied in data centers and laboratories requiring local logic execution and independent operation
- Retrofit Projects: Specified for upgrades where point count and expansion capability allow enclosure and field wiring preservation
Schneider BACnet system controller
,BACnet controller 16 sensor inputs
,Smart building controller triac outputs
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