SIEMENS TXM1.8U 8-point Analog Input Module

Description

SIEMENS TXM1.8U 8-point Analog Input Module

Product Dimensions：

The Siemens TXM1.8U is an 8-input/output universal module from the Desigo TX-I/O range. It is used in building automation and control systems (BACS) to interface field devices with Desigo programmable controllers.

Product Detailed Description

The TXM1.8U is a highly flexible, software-configurable expansion module. Each of its 8 channels can be independently configured as either a digital input, analog input, or analog output. It communicates natively with the automation station via the TX-I/O island bus, allowing for decentralized installation within control panels.

Technical Parameters

Product Advantages

• Universal Flexibility: Since every point can be configured as an input or an output, it optimizes inventory management and maximizes panel space utilization.
• Hot-Swappable Design: The module consists of a terminal base and a plug-in electronic unit. The electronic unit can be replaced while the system is live without interrupting the wiring or bus signal.
• Direct Terminal Connection: Eliminates the need for intermediate terminal strips because field devices connect directly to the module’s base.
• Integrated Diagnostics: Features local LED status indicators for each I/O point, enabling fast visual troubleshooting of field wiring and signal faults.

Important Considerations & Precautions

• Current Limits: When utilized as an analog output, the max current is 1 mA per channel. Do not attempt to drive heavy loads or relays directly; use an external coupling relay or signal amplifier.
• Sensor Compatibility: Ensure that the specific temperature sensor curves (e.g., Pt1000 vs. Ni1000) are explicitly matched in the Desigo CC or Desigo Xworks software configuration.
• Bus Termination & Power: The module relies on the TX-I/O power supply module (e.g., TXS1.12F10). Ensure the cumulative power consumption of all connected modules does not exceed the supply rating.
• Shielding: To prevent electromagnetic interference (EMI) on sensitive 0-10V or Pt1000 analog signals, use twisted, shielded cables and ground the shield properly at the panel enclosure.

Product Applications

The TXM1.8U is widely deployed in Heating, Ventilation, and Air Conditioning (HVAC) as well as building facility management:

• Air Handling Units (AHUs): Measuring temperature/humidity sensors (AI) and controlling damper actuators (AO) simultaneously.
• Chiller & Boiler Plants: Monitoring pump statuses (DI), pressure sensors (AI), and modulating control valves (AO).
• Lighting Control: Interfacing with occupancy sensors or manual switches (DI) to control lighting circuits via relays.
• Energy Management: Reading pulsed outputs from electricity or water meters (DI with counter capability) for central data logging.

Shipping Port: Xiamen, China

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