SIEMENS TXS1.12F10 Power Supply Module

Description

SIEMENS TXS1.12F10 Power Supply Module

Product Overview

The Siemens TXS1.12F10 is a TX-I/O™ Power Supply Module designed for building automation and HVAC control systems operating within the Siemens Desigo™ system architecture.

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Positioned at the start of a TX-I/O module row, the TXS1.12F10 converts an incoming 24 V AC supply into an internal 24 V DC supply (1.2 A / 1200 mA) to power connected TX-I/O modules and peripheral field devices via the self-establishing island bus. It also incorporates an integrated 10 A fuse to protect the 24 V AC field device power supply line.

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Technical Specifications

Key Advantages

• Self-Establishing Island Bus: Automatically transfers power (24 V DC and 24 V AC) and communication bus signals to adjacent TX-I/O modules without external ribbon cables or manual inter-module wiring.

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• Parallel Power Expansion: Supports up to 4 units in parallel on a single I/O island to accommodate larger controller configurations and high current demands.

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• Integrated Field Protection: Features a front-accessible 10 A fuse specifically dedicated to safeguarding connected 24 V AC field sensors and actuators.

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• Fast Visual Diagnostics: Dual LED indicators provide instant status feedback for both the 24 V DC logic power bus and the 24 V AC field power circuit.

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• Tool-Free Modular Installation: Plugs directly onto standard 35 mm DIN rails with quick-release plug-in screw terminals for simplified maintenance and replacement.

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Important Usage & Installation Precautions

• Fuse Access & Replacement: Ensure the replaceably rated 10 A fuse matches original Siemens specifications (10 A medium-time lag). Always disconnect power before replacing fuses to prevent arcing.

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• Thermal Dissipation: The module relies on natural air convection through top and bottom vents. Maintain required clearances inside control cabinets, ensuring ambient operating temperatures do not exceed 50 °C.

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• Enclosure Protection: Rated IP20. It must be installed inside an IP54 or NEMA-rated control panel when deployed in humid, dusty, or harsh mechanical environments.
• Island Bus Current Limits: Calculate the total current draw of all connected TX-I/O modules and field devices on the bus row to ensure it does not exceed the maximum allowed current. Add additional power supply modules (up to 4) or bus extension modules where required.

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• Correct Bus End Covers: Always fit the supplied bus connector end covers onto the leftmost and rightmost ends of the TX-I/O island bus to protect exposed pins from accidental contact or short circuits.

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Applications

• Desigo Building Automation Systems (BAS): Serves as the primary power feeder for Siemens Desigo PXC automation stations and associated TX-I/O expanding islands.
• HVAC Control Panels: Supplies regulated power to field devices such as dampers, valve actuators, temperature/pressure sensors, and flow meters.
• Distributed I/O Power Segmentation: Used to partition and isolate power supply sections across multiple DIN rail rows in large industrial and commercial control cabinets.

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