Siemens TXB1.PBUS Interface Module

Description

Siemens 545-1106 CPU Module

Product Dimensions：

The Siemens TXB1.PBUS is a dedicated P-Bus Interface Module designed for Siemens Desigo TX-I/O building automation systems. It acts as a bridge, allowing modern TX-I/O modules to integrate smoothly with legacy Siemens process controllers (such as UNIGYR or VAV controllers) that communicate over the proprietary P-Bus protocol.

Product Detailed Description

The TXB1.PBUS connects directly to the self-forming TX-I/O island bus on the DIN rail. It provides the necessary power supply generation and signal conversion to enable communication between TX-I/O modules and existing P-Bus automation systems. It handles both data translation and 24 V DC power distribution across the module bus.

Technical Parameters

Product Advantages

• Seamless Retrofitting: Enables upgrading legacy P-Bus installations to modern TX-I/O hardware without replacing existing central controllers or rewriting entire control systems.
• Integrated Power Generation: Generates a stabilized DC 24 V supply to power connected I/O modules and active field sensors.
• Onboard Diagnostics: Features multi-LED indicators for immediate feedback on power status, bus communication, and fuse integrity.
• Local Maintenance Port: Includes an integrated USB port for connecting the Siemens TX-I/O service and commissioning tool directly at the rack.

Important Considerations (Precautions)

• Fuse Protection: The AC 24 V field supply output relies on a 10 A slow-blow fuse. If field device current exceeds 10 A, additional power supply expansion modules are required.
• Parallel Power Operations: Up to 3 power supply modules can operate in parallel with a single bus interface module, but no more than 1 additional supply per individual I/O bar section.
• Power Supply Class: Use SELV or PELV Class 2 AC 24 V power sources to maintain compliance and system safety ratings.
• Bus Termination: Ensure proper bus covers and end terminators are installed on the rightmost edge of the TX-I/O bar to prevent signal interference.

Product Applications

The TXB1.PBUS is used specifically in building management systems (BMS) and HVAC automation:

• Legacy System Upgrades: Migration projects replacing older Landis & Gyr / Siemens UNIGYR I/O hardware with modern TX-I/O modules.
• HVAC Control Racks: Interfacing mixed I/O racks (temperature, pressure, actuators) to central automation stations over the P-Bus protocol.
• Air Handling Units (AHU): Managing distributed sensors and valves connected to legacy building automation controllers.

Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapore

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