TAC Xenta 701 SCHNEIDER Programmable controller

Description

TAC Xenta 701 SCHNEIDER Programmable controller

Product Dimensions：

Product Description

The TAC Xenta 701 is a high-performance, freely programmable digital controller designed for advanced control and management of various HVAC systems and building services. It is characterized by its modern architecture and support for multiple communication protocols.

• Type: Multi-protocol (BACnet MS/TP and LonWorks) Freely Programmable Controller.

• Function: It acts as a powerful field controller that executes sophisticated control logic (developed in the TAC Menta graphical tool) for large pieces of equipment like central utility plants, Air Handling Units (AHUs), or even as a small system supervisor.

• Protocols: The key feature of the Xenta 700 series is its flexibility to operate within a BACnet MS/TP network or a LonWorks network, depending on the configuration and network needs, enhancing system integration capabilities.

• I/O: The 701 model has a fixed, substantial set of integrated I/O points, including Universal Inputs, Digital Inputs, and Triac/Digital Outputs, suitable for complex control applications.

• Expansion: Unlike simpler controllers, the 701 is capable of expanding its I/O count by integrating the dedicated I/O expansion modules (e.g., Xenta 421/422).

Product Specifications

Product Advantages

• Multi-Protocol Capability: The primary advantage is the built-in support for BACnet MS/TP, the most widely used open protocol for BMS systems, alongside LonWorks, providing maximum versatility and integration potential.

• High Control Capacity: With a total of 12 Inputs (8 UI + 4 DI) and 12 Digital Outputs, the 701 can independently handle the control logic for complex, multi-stage equipment.

• Advanced Control Logic: As a fully programmable controller using the Menta tool, it supports complex PID loops, optimal start/stop, scheduling, and custom alarming/trending.

• I/O Expansion Support: The ability to add Xenta 400 series expansion modules makes the 701 extremely scalable, capable of managing hundreds of points across a zone or system.

• User Interface: The optional local display allows technicians to view current values, adjust setpoints, and override control states without needing a supervisory workstation.

Precautions

• Triac Output Limitations: The 12 Digital Outputs are typically Triac outputs, which are generally only suitable for $24\,\text{V AC}$ loads and have a low current rating (Max $0.5\,\text{A}$). They are ideal for electronic actuators or small relays, but not for switching high-current or high-voltage line loads. Use interposing relays for heavy loads.

• Protocol Selection: The specific communication protocol (BACnet or LonWorks) must be correctly configured during commissioning to match the requirements of the building network.

• I/O Wiring: Extreme care must be taken when wiring the outputs, ensuring the $24\,\text{V AC}$ common is correctly referenced for the Triac outputs. Refer to the specific wiring schematic for the device.

• Programming Software: The device requires the use of the TAC Menta graphical programming tool for developing the control application and a corresponding network tool (e.g., TAC Vista) for commissioning and binding.

• Power Quality: Ensure a stable $24\,\text{V AC}$ supply. Due to the high number of integrated outputs, proper transformer sizing is critical.

Product Applications

The Xenta 701 is deployed where high-level, sophisticated control and multi-protocol networking are essential.

• Large Air Handling Unit (AHU) Control:

  • Managing complex sequences for economizers, multiple heating/cooling stages, humidification/dehumidification, and fan speed control.

• Central Plant Equipment:

  • Controlling sequences and optimizing performance for Chillers, Boilers, and Cooling Towers, often integrating flow sensors (UI) and pump status (DI).

• Critical Zone Control:

  • Used in areas like laboratories, operating rooms, or data centers that require precise environmental control, trending, and redundancy.

• Small System Supervisor:

  • In smaller installations, the 701 can act as a combined controller and supervisor, managing its own I/O and communication with other network devices.

Shipping Port: Xiamen, China

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