Siemens TXM1.8D 8-channel Digital Input Module

Description

Siemens TXM1.8D 8-channel Digital Input Module

Product Dimensions：

The Siemens TXM1.8D is a high-performance Digital Input module belonging to the TX-I/O™ range, designed for use within the Desigo™ Building Automation System. It serves as a robust interface for capturing status and pulse signals from field devices.

## Product Overview

The TXM1.8D provides 8 digital inputs that can be individually configured. It is designed for seamless integration with Siemens BIM (Building Information Modeling) standards and communicates via a dedicated I/O bus.

### Key Technical Parameters

## Product Advantages

• Space-Efficient Design: Compact modular footprint allows for high-density installations in control panels.

• Hot-Swappable: The “Permanent Wiring” concept allows the module to be replaced without disconnecting field wires or interrupting the bus communication.

• Visual Diagnostics: Each input features a green LED indicator that reflects the current state (On/Off) of the field device at a glance.

• Versatility: Can function as a simple status monitor (e.g., “Fan On”) or a high-speed counter for metering applications.

• Seamless Integration: Fully integrated into the Siemens Desigo toolchain for rapid engineering and commissioning.

## Product Applications

The TXM1.8D is primarily used in HVAC and building services to monitor:

• Equipment Status: Monitoring the run/stop status of fans, pumps, and motors.

• Fault Alarms: Receiving dry-contact signals from fire alarm panels, pressure switches, or thermal overloads.

• Pulse Integration: Reading pulses from flow meters, energy meters, or gas meters for consumption tracking.

• Occupancy Sensing: Interfacing with motion sensors or window contacts for energy management.

## Important Precautions (Usage Notes)

1. Wiring Distance: Ensure the cable length to field contacts does not exceed the maximum specified limits (typically 300m) to avoid signal interference.

2. Voltage Warning: The inputs are designed for volt-free (dry) contacts only. Applying external voltage to the input terminals can permanently damage the module.

3. Address Keys: Ensure the I/O address key is correctly set; the system will not recognize the module if the address is duplicated or missing.

4. Grounding: Proper termination of cable shields is essential in environments with high electromagnetic interference (EMI).

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