The DDC (Direct Digital Control) Panel is the core hardware carrier of the Building Automation System (BAS). It undertakes data collection, logical calculation, linkage control, and remote monitoring for HVAC, water supply and drainage, fresh air, lighting, cooling and heating sources, and other equipment in buildings. It is the key equipment for buildings to transform from “traditional operation" to “intelligent and energy-saving".

Equipped with Schneider Electric’s SpaceLogic series DDC controllers and I/O expansion modules, it achieves stable, flexible, and scalable building automation control, widely used in office buildings, hospitals, shopping malls, data centers, hotels, and other high-end buildings.

1. Core Value of DDC Building Control Panels

1. Precise Control for Improved Comfort

   Real-time collection of temperature, humidity, pressure, flow, liquid level, and other parameters with millisecond-level response adjustment to maintain stable indoor environment.

2. Energy Saving and Cost Reduction

   Through timing control, closed-loop regulation, and linkage strategies, energy consumption of HVAC and lighting systems can be reduced by 15%~30%.

3. Centralized Management and Remote O&M

   Supports BACnet/Modbus protocols for access to host computer platforms, enabling remote monitoring, fault alarms, and program modification.

4. Flexible Expansion for Full-Scenario Adaptation

   Modular design allows I/O expansion to meet demands from small units to large building complexes.

2. Typical Schneider Core Modules in DDC Control Panels

① Main Controller: The “Brain"

• SXWASB24PX10001 (AS-B-24-P)

  24-point built-in I/O automation server with LCD display, supporting BACnet/Modbus. Ideal for small-to-medium DDC panels for AHU and pump control.

• B3624 / B3804

  Classic BACnet DDC controllers with high reliability, widely used in hospitals, government buildings, and critical projects.

② I/O Expansion Modules: The “Limbs"

• CIO20XX10001

  20-point mixed central I/O module (8DI + 8UI + 4DO), supporting NTC, 0–10V, 4–20mA inputs.

• SXWAOV8XX10001

  8-channel 0–10V analog output module for valve, damper, and dimmer control.

• SXWPS24VX10001

  24V dedicated power supply module for stable power to controllers and I/O modules.

③ Sensors: The “Senses"

• 5123174010 (STP500-150)

  Immersion temperature sensor for water pipes.

• 5141104010 (STO500)

  Outdoor temperature sensor.

• 004701060 (SPD910-300Pa)

  Air differential pressure switch for filter clogging and duct static pressure monitoring.

• HD5XMSTN

  Duct-mounted temperature and humidity sensor.

④ Intelligent Perception & KNX Control

• MTN6300-0019

  Ceiling-mounted presence detector for lighting and HVAC energy saving.

3. Standard Working Flow of DDC Building Control Panels

1. Collection: Schneider sensors convert physical signals into electrical signals.
2. Calculation: Main controllers such as SXWASB24PX10001 execute logic programs.
3. Execution: Modules like SXWAOV8XX10001 drive valves, fans, and lighting.
4. Upload: Data is sent to EcoStruxure BMS for monitoring and reporting.
5. Alarm: Automatic alarm for abnormal status.

4. Application Scenarios

• Air Handling Unit (AHU) and Fresh Air Unit (PAU) control
• Cooling and heating station, pump, and cooling tower linkage
• Intelligent lighting, exhaust, and water supply/drainage monitoring
• Precision environment control in clean rooms and data centers
• Building group control in commercial complexes, offices, and hospitals

5. Summary

The DDC Building Control Panel is the nerve center of smart buildings. Schneider’s SpaceLogic series provides high stability, strong compatibility, easy expansion, and long service life.

From the main controller SXWASB24PX10001, to expansion modules CIO20XX10001 and SXWAOV8XX10001, and a full range of sensors, Schneider forms a complete building automation ecosystem that meets current control needs and supports future system upgrades — making buildings smarter, energy lower, and operation simpler.