TAC Xenta 451A SCHNEIDER

TAC Xenta 451A SCHNEIDER Input module

Brand：SCHNEIDER Model number：TAC Xenta 451A

Country of origin: France Product weight：0.55kg

HS code：853710119

Product Details：

Product Dimensions：

The Xenta 451A is often referred to as a Communication and Application Controller or a router/controller. It functions as a powerful, free-programmable controller for various building management applications, while also serving as a crucial link between different parts of the LonWorks network or between the LonWorks network and other systems (like TCP/IP networks via a LonWorks/IP router). It is part of the former TAC (now Schneider Electric) Building Automation portfolio.

Product Specifications

Controller Type: Programmable LonWorks Controller
Communication Protocol: LonTalk/LonWorks FTT-10A (Free Topology Twisted Pair)
Connectivity: Features two LonTalk ports, often configured as an internal router to segment the network or to interface with a LonWorks/IP router for wider network communication.
Programming: Programmed using the TAC Menta graphical programming tool.
Application Focus: Designed for supervisory control, global control, energy management, and complex system-wide control applications rather than direct field I/O control (which is typically handled by Xenta 300 series controllers).
Power Supply: Typically operates on $24 \text{ VAC}$ or $24 \text{ VDC}$ .
Mounting: Designed for DIN-rail mounting.
Internal Memory: Includes memory for the application program, configuration data, and logging capabilities.
I/O Capability: Unlike field controllers, the 451A generally does not feature built-in physical inputs or outputs for connecting directly to sensors and actuators; its power lies in its communication and application processing capabilities across the network.

Product Advantages

High-Level Control: Allows for the implementation of complex, building-wide control strategies, such as centralized scheduling, demand limiting, optimal start/stop, and energy consumption monitoring.
LonWorks Integration: Provides native, robust communication within the LonWorks network, ensuring interoperability with other LonMark-certified devices.
Free Programmability: The use of the TAC Menta graphical programming environment offers flexibility, allowing users and system integrators to create customized control logic specific to the building's needs.
Network Segmentation and Routing: Its dual-port configuration often enables it to act as a router within the LonWorks network, helping to manage network traffic and segment large installations for improved performance and reliability.
Scalability: It enhances the overall scalability of the building automation system by managing and supervising numerous field controllers and their data.

Important Considerations (Precautions)

Legacy Status: The TAC Xenta line is a legacy system. While still supported in many existing installations, new systems typically utilize newer Schneider Electric platforms like EcoStruxure Building Operation, which may affect long-term product availability and support.
Programming Requirement: The controller requires specific knowledge of the TAC Menta graphical programming environment and LonWorks protocol for successful configuration and commissioning.
Network Design: Proper LonWorks network design, including termination, wiring topology, and network variable binding, is critical for the reliable operation of the Xenta 451A.
Power Supply: Ensure a stable and correctly specified $24 \text{ VAC}$ or $24 \text{ VDC}$ power source is used, as incorrect voltage or unstable power can lead to operational issues.
Environment: The device should be installed in a clean, dry location, typically within a control panel, protected from direct sunlight, excessive heat, and high humidity, as is standard for industrial electronic controllers.

Product Applications

The Xenta 451A is deployed in medium to large commercial and institutional buildings to serve as the supervisory layer of the Building Automation System.

Central Plant Control: Managing complex central HVAC equipment like chillers, boilers, and heat recovery systems, optimizing their collective operation based on building demand and external conditions.
Energy Management Systems (EMS): Implementing energy-saving routines, load shedding, and monitoring key performance indicators (KPIs) for energy use across the facility.
Global Control Functions: Handling site-wide functions such as fire alarm interfaces, facility scheduling, holiday control, and inter-system data sharing between different zones.
Data Concentration and Logging: Collecting data from various field controllers for trending, historical logging, and reporting to higher-level management systems or HMIs.

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