TXM1.8D SIEMENS

TXM1.8D Siemens Basis unit

Brand：SIEMENS Model number：TXM1.8D

Country of origin: Germany Product weight：0.55kg

HS code：8517623990

Product Details：

Product Dimensions：

The TXM1.8D is a specialized I/O module featuring 8 digital inputs. Each of these inputs is independent and can be individually configured via software to handle different types of signals. The module is housed in a compact, DIN-rail mountable casing that follows the standard Desigo aesthetic, allowing for organized and space-saving installation within electrical control panels. It communicates with the primary controller through the TX-I/O bus, which also provides the necessary operating power to the module.

Product Parameters

The technical specifications of the TXM1.8D highlight its versatility in industrial and commercial environments. The module operates on a supply voltage of 24 VDC provided by the bus connection. It features 8 digital input points, which can be configured for status indications (such as on/off states), maintenance messages, or pulse counting. For pulse applications, the module supports a maximum frequency of $20 \text{ Hz}$ or $25 \text{ Hz}$ depending on the configuration and signal type. The input voltage for a "high" signal typically ranges from 15 to 24 VDC, while a "low" signal is recognized below 5 VDC. The unit is designed for an operating environment between -5°C and 50°C and carries an IP20 protection rating.

Product Advantages

A major advantage of the TXM1.8D is its "plug-and-work" capability. The module can be replaced without the use of tools and without reprogramming, as the configuration is stored in the terminal base or the controller. The 8-point density provides an efficient balance between cost and space. Furthermore, the module includes integrated status LEDs for each input, allowing technicians to perform instant visual diagnostics on-site without needing a laptop. Its ability to handle both simple status monitoring and high-speed pulse counting makes it a multipurpose component in any HVAC or building control architecture.

Important Considerations and Precautions

When installing the TXM1.8D, it is crucial to ensure that the total power consumption of all modules on the bus does not exceed the capacity of the power supply module. Before inserting or removing the module from the terminal base, it is highly recommended to power down the system to prevent any potential electronic surge, although the TX series is designed for robust handling. Users must also ensure that the maximum cable length for inputs is respected—typically up to 300 meters with unshielded cable—to maintain signal integrity and prevent electromagnetic interference from triggering false status changes. Proper grounding of the DIN rail is also essential for reliable operation.

Product Applications

The TXM1.8D is predominantly used in large-scale building automation systems (BAS) for monitoring critical infrastructure. Common applications include:

HVAC Monitoring: Tracking the status of fan motors (run/stop), pump operations, and filter clog indicators via differential pressure switches.
Energy Metering: Capturing pulse outputs from water, gas, or electricity meters to calculate total consumption over time.
Safety and Security: Monitoring fire alarm contacts, smoke detectors, and security door switches.
Electrical System Supervision: Interfacing with circuit breaker auxiliary contacts to alert the system of a power trip or manual override.
Elevator Systems: Monitoring the operational status and fault contacts of vertical transportation systems within a commercial building.

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