TAC Xenta 422 SCHNEIDER Controller module

Description

TAC Xenta 422 SCHNEIDER Controller module

Product Dimensions：

Product Description

The TAC Xenta 422 is an I/O expansion module used primarily in building management systems (BMS) to extend the input and output capacity of a main TAC Xenta controller (like the Xenta 300 or 400 series).

Unlike a standalone controller, the Xenta 422 is a slave device that communicates with the main controller over a LonWorks network. It provides additional physical connections for field devices in a robust, DIN-rail-mountable package.

• Type: Universal Input and Digital Output Expansion Module.

• Function: It is designed to read signals from various field sensors and provide on/off control signals to equipment based on commands from the main controller.

• Inputs: It features 8 Universal Inputs (UI), meaning all eight channels can be individually configured for multiple signal types (voltage, current, thermistor, or digital contact).

• Outputs: It is equipped with 3 Digital Outputs (DO), implemented as dry contact relays.

• Configuration: The module’s behavior and input/output definitions are set up using the TAC Menta® engineering tool and linked to the application running on the main controller.

Product Specifications

Product Advantages

• High Input Density: The Xenta 422 provides 8 Universal Inputs, making it ideal for applications that require extensive monitoring and sensing (e.g., VAV boxes, multi-zone temperature monitoring).

• Ultimate Flexibility: The Universal Inputs are the primary strength. They allow engineers to use one module to handle virtually any type of field sensor, drastically reducing complexity and required inventory.

• LonWorks Compatibility: Ensures reliable, standard-based communication and integration with existing Schneider Electric/TAC systems and other LonMark devices.

• Scalability: Allows the system to grow by adding I/O points remotely, minimizing the need for long, expensive wiring runs back to the main controller.

• Cost-Effective Expansion: Provides a straightforward and economical way to increase the I/O count of the main controller when its native points are exhausted.

Precautions

• Relay Limits: The Digital Outputs are rated for a maximum of 2 A resistive load at 250 V AC. Do not exceed these limits, and always use external fusing and isolation for control of high-current loads.

• Power Verification: The module requires a stable 24 V AC supply. Verify that the system transformer has sufficient capacity to handle all connected modules and field devices.

• Network Addressing: The module must be properly addressed (using LonWorks techniques, typically through the engineering tool) to communicate effectively with the main Xenta controller.

• Wiring Practice: Follow the manufacturer’s guidelines for wire termination, shielding of analog signals, and separation of high-voltage (DO) and low-voltage (UI) wiring to prevent noise interference.

• Engineering Tool: Proper functionality depends entirely on the correct configuration using TAC Menta, ensuring the UI type (e.g., 0-10V, 10k $\Omega$) is correctly matched to the connected sensor.

Product Applications

The Xenta 422 is most commonly deployed in building automation environments where a high number of inputs are required for monitoring, often combined with a lower requirement for direct equipment control outputs.

• Variable Air Volume (VAV) Systems:

  • Monitoring Duct Static Pressure ($0-10\,\text{V}$ input).

  • Monitoring Space and Discharge Air Temperature (Thermistor inputs).

  • Receiving Tenant Override Status (Digital Input).

• Central Plant and AHU Monitoring:

  • Monitoring the status (run/fault) of pumps and fans (Digital Inputs).

  • Monitoring Valve or Damper position feedback ($0-10\,\text{V}$ or $0-20\,\text{mA}$ input).

  • Providing control signals (Digital Outputs) for smaller components like pilot relays or isolation devices.

• General Area Control:

  • Interfacing with a large number of fire and security system status contacts (Digital Inputs).

  • Monitoring lighting levels or occupancy sensors via their $0-10\,\text{V}$ or digital outputs.

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