Siemens TXA1.IBE Building Automation I/O Bus Expansion Module

Product Overview

The Siemens TXA1.IBE is a TX-I/O Island Bus Expansion Module designed for Desigo building automation systems. Rather than serving as a standard digital or analog I/O module, it is an RS-485 island bus expansion module used to extend the communication distance and connect additional TX-I/O modules within a Desigo Room Automation system.

Key Specifications

• Brand: Siemens
• Model: TXA1.IBE
• Series: TX-I/O (Desigo Room Automation)
• Product Type: Island Bus Expansion Module
• Communication: RS-485 Island Bus
• Supply Voltage: 24 VDC
• Maximum Cable Length (between modules): 50 m
• Maximum Island Bus Extension: Up to 400 m
• Configuration: DIP switches for bus master configuration
• Installation: 35 mm DIN rail mounting
• Connection: Plug-in screw terminals
• Application: Expansion of TX-I/O bus segments in building automation systems

What It Does (Simple Explanation)

The TXA1.IBE extends the communication bus used by Siemens TX-I/O modules.

Typical operation:

1. Connects to the existing TX-I/O island bus.
2. Extends RS-485 communication to a remote group of I/O modules.
3. Allows distributed installation of field I/O throughout a building.
4. Maintains reliable communication between the Desigo automation station and remote TX-I/O modules.

This enables flexible installation while reducing field wiring costs.

Key Features

• RS-485 island bus expansion
• Supports distributed TX-I/O installations
• Extends total bus distance up to 400 m
• Operates from 24 VDC
• Compact DIN rail design
• Plug-in terminal connections
• DIP switch configuration
• No programming required for basic installation

Advantages

• Simplifies large building automation installations
• Reduces long field wiring runs
• Supports decentralized I/O architecture
• Easy installation and maintenance
• High communication reliability
• Fully compatible with Siemens Desigo TX-I/O systems

Applications

• Commercial building automation
• HVAC control systems
• Office buildings
• Hospitals
• Hotels
• Universities
• Industrial facility management
• Desigo Room Automation systems