TAC Xenta 451A SCHNEIDER Processor module

Description

TAC Xenta 451A SCHNEIDER Processor module

Product Dimensions：

Product Description

The TAC Xenta 451A is a fully programmable, microprocessor-based LonWorks controller designed to manage complex control processes in HVAC and building automation applications. Unlike the Xenta 421/422 series, the 451A is not an I/O expansion module, but rather the main brain of a local control strategy.

• Type: LonWorks Network Variable (NV) Programmable Controller (sometimes referred to as a Router Controller).

• Function: It executes a control application program (created using the TAC Menta graphical tool) to regulate and monitor large pieces of equipment or entire zones. It is capable of receiving inputs, processing complex logic, and sending commands to its own outputs or to linked I/O modules like the Xenta 421/422.

• Networking: It includes built-in LonWorks network capabilities, allowing it to communicate with other controllers, sensors, and the building supervisor (like TAC Vista).

• I/O: It comes with a substantial set of integrated Universal Inputs (UI) and Universal Outputs (UO) directly on the module, making it suitable for controlling packaged units or medium-sized equipment independently.

Product Specifications

Product Advantages

• Powerful Control Engine: As a programmable controller, it runs complex, customized control strategies locally, ensuring faster response times and reliable operation independent of the supervisory system.

• High I/O Count: With 12 UIs, 8 UOs, and 4 DOs, it provides a high density of control points on a single chassis, suitable for controlling large Air Handling Units (AHUs) or complex central plant equipment.

• Universal I/O Flexibility: The combination of Universal Inputs (monitoring) and Universal Outputs (modulating control) allows it to handle both analog (e.g., $0-10\,\text{V}$ valve control) and digital (e.g., fan start/stop) requirements.

• Open Protocol: Based on the LonWorks protocol, it facilitates interoperability with thousands of other LonMark devices and systems.

• Graphical Programming: The use of TAC Menta allows for application development using intuitive function blocks and wiring diagrams, reducing coding complexity and maintenance time.

Precautions

• Commissioning/Programming: The Xenta 451A requires proper engineering and commissioning using specialized software (TAC Menta and TAC Vista or similar configuration tool) to download the application program and bind the network variables. It is not plug-and-play.

• Universal Output Configuration: When configuring the UOs, ensure they are set correctly as either Analog ($0-10\,\text{V}$) for modulating devices (e.g., VFDs, valves) or Digital (Triac) for on/off $24\,\text{V}$ AC control. Incorrect settings can damage field devices.

• Relay and Triac Limits: Respect the current limits for both the relay outputs (Max 2 A) and the triac outputs (typically limited to smaller inductive loads and voltage). Use interposing relays for high-current or high-voltage loads.

• Battery Maintenance: The internal battery for the Real-Time Clock (RTC) should be checked and replaced periodically to ensure accurate timekeeping and scheduling functionality is maintained during power outages.

• Firmware Updates: Ensure the controller is running the latest stable firmware compatible with the supervisory system for optimal performance and security.

Product Applications

The TAC Xenta 451A is utilized in applications that require sophisticated control logic and a large number of integrated inputs and outputs.

• Air Handling Unit (AHU) Control:

  • Reading Mixed, Return, and Discharge Air Temperatures (UIs).

  • Monitoring Filter Status and Fan Status (DIs/UIs).

  • Controlling Heating/Cooling Valves and Damper Actuators (UOs for modulation).

  • Sending Fan Start/Stop commands (DOs or UOs configured as DI).

• Central Plant Management:

  • Controlling Boiler/Chiller Sequencing and Setpoint Management.

  • Managing Pumps and Primary/Secondary Flow Loops.

• Complex Zone Control:

  • Used in critical zones or large open-plan offices requiring cascading control loops, multiple sensor inputs, and integration with specialized equipment.

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