SXW-DO-FA-12-h SCHNEIDER

SXW-DO-FA-12-h SCHNEIDER Input module

Brand：SCHNEIDER Model number：SXW-DO-FA-12-h

Country of origin: France Product weight：0.55kg

HS code：853710119

Product Details：

Product Dimensions：

The SXW-DO-FA-12-h is a 12-channel digital output module. It is part of the SpaceLogic (formerly SmartStruxure) I/O system, which is characterized by its modular, hot-swappable design. The module is housed in a compact, DIN-rail mountable enclosure and features a unique terminal base system that allows for pre-wiring before the electronic module is even attached. This specific model uses Form A (normally open) relays, making it suitable for controlling a variety of equipment in building management systems (BMS).

Product Parameters

Product Series: SpaceLogic / EcoStruxure Building Operation
Digital Outputs: 12 Channels
Output Type: Form A (Normally Open) relay contacts
Override Switches: Integrated Hand-Off-Auto (HOA) switches for each output
Manual Feedback: Status indicators on the front panel reflect the state of the relay even when in manual mode
Input Power: Powered through the backplane of the I/O bus (24 VDC)
Maximum Switching Voltage: Typically $250 \text{ VAC}$ or $30 \text{ VDC}$
Maximum Switching Current: Up to $2 \text{ A}$ per channel (resistive load)
Status Indicators: LED lights for each output to indicate On/Off state
Enclosure Rating: IP20 protection degree
Mounting: Standard $35 \text{ mm}$ DIN rail

Product Advantages

One of the most significant advantages of this module is the integrated HOA switches. These allow technicians to manually override the system during commissioning, maintenance, or emergency situations without needing to access the software. The Hot-Swappable Design is another major benefit; modules can be replaced under power without disrupting the rest of the I/O bus, which significantly reduces downtime.

The High Density of 12 outputs in a small footprint helps save valuable space in control panels. Furthermore, the Seamless Integration with EcoStruxure Building Operation software means that the module is automatically discovered and easily configured through the AS-P server, reducing engineering time. The Form A relays provide reliable electrical isolation between the control electronics and the field devices.

Important Considerations and Precautions

When installing the SXW-DO-FA-12-h, you must ensure that the total current load across all 12 channels does not exceed the power limits of the backplane or the terminal base. It is crucial to verify that the Load Characteristics (inductive vs. resistive) are within the module's rated capacity; for highly inductive loads like large motor starters, external snubbers or interposing relays may be required to protect the internal contacts from arcing.

Always ensure the Terminal Base (SXW-TBI-S3-1 or equivalent) is correctly seated on the DIN rail before snapping the module into place. Before performing any maintenance, check the position of the HOA switches, as an output left in the "Hand" (Manual On) position will remain energized regardless of the software logic, which could pose a safety risk if not monitored. Lastly, ensure that the $24 \text{ VDC}$ power supply for the I/O bus is stable and within the specified voltage range to prevent communication errors.

Product Applications

The SXW-DO-FA-12-h is specifically tailored for building automation and HVAC control applications.

Lighting Control: Managing multiple lighting zones or floors within a commercial building.
Fan and Pump Command: Controlling the start/stop sequences of AHU fans, exhaust fans, and secondary pumps.
Unitary Equipment: Interfacing with fan coil units (FCUs) or heat pumps to control heating/cooling stages.
Alarm Signaling: Activating external sirens, beacons, or relaying status to third-party security systems.
Industrial Auxiliary Control: Managing low-power auxiliary circuits in industrial environments where building automation protocols are required.

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