TXB1.PBUS

What type of device is this?

This is a Siemens P-bus interface module used to connect a TX-I/O module system to an automation station with a P-bus interface. It acts as the link between the automation station and TX-I/O modules, while also providing power and diagnostic indication for the I/O island.

What is the main application of this interface module?

The module is designed for building automation systems where TX-I/O modules need to be connected to a Siemens automation station using P-bus communication. It is commonly used in control panels for HVAC, building management and field device integration.

What supply voltage does the module use?

The module operates from an AC 24 V supply. The operating range is AC 24 V with a tolerance of -10% to +20%, at 50 to 60 Hz.

Does the module provide power for connected I/O modules?

Yes. TXB1.PBUS includes an integrated DC 24 V output for TX-I/O modules and field devices. The DC output is rated up to 1.2 A and includes short-circuit and overload protection.

What is the maximum AC output current?

The AC 24 V field supply output is rated up to 6.0 A. It is protected by a replaceable medium time-lag 10 A fuse.

What communication connections are provided?

The module provides P-bus communication terminals for PC, PU and PD, as well as island bus terminals for CS and CD. Both the island bus and P-bus communication connections are listed as short-circuit-proof.

What is the USB port used for?

The USB Type B port is used with the TX-I/O configuration tool for configuration, simulation and diagnostics. The USB interface operates at USB 1.0 Full Speed, 12 Mbit/s.

What do the LED indicators show?

The front LEDs indicate operating and diagnostic states. RUN shows that the device CPU is operating, FLT indicates a fault or configuration activity, COM indicates P-bus communication, and the supply LEDs show the AC 24 V field supply and DC 24 V module supply status.

How is the module mounted?

The module is designed for mounting on a standard 35 x 7.5 mm top-hat rail to EN 60715. It is intended to be the first device on the left side of an I/O bar where it provides the power and interface functions for the connected modules.

What are the housing dimensions?

The housing is 90 mm wide and follows DIN 43880 format. Key dimensions include approximately 90 mm width, 108 mm height and 70 mm depth, with further mounting dimensions specified for panel layout.

What terminal conductor sizes can be used?

The plug-in screw terminals accept solid or stranded copper conductors. Depending on conductor type and use of sleeves, terminals can accept up to 2.5 mm² for a single conductor, with a maximum tightening torque of 0.6 Nm.

What environmental conditions is the module designed for?

The module is rated for operation from -5 to 50 °C with 5 to 95% relative humidity. Adequate panel ventilation is important to keep the ambient temperature within the permitted range.

What protection ratings apply to the housing?

The front-plate components in a DIN cut-out are rated IP30, while the terminal section is rated IP20. The device is classified as protection class III.

Can it be used with other TX-I/O equipment?

Yes. The Siemens TXB1.PBUS bus interface module is suitable for use with equipment in the TX-I/O range and can be combined with suitable power supply modules in an I/O island.

What standards and approvals are associated with this module?

The module is associated with EN 60730-1 for automatic electrical controls and is intended for residential, commercial, light-industrial and industrial environments. It also has CE, RCM, EAC and UL certification references.