SIEMENS TXM1.4D3R Digital Input Module

Product Overview

Brand: SIEMENS
Model: TXM1.4D3R
Product Type: Digital Input and Relay Output Module
Series: TX-I/O™
Application: Building Automation / HVAC Control / Desigo Systems

The SIEMENS TXM1.4D3R is a mixed digital input and relay output module from the Siemens TX-I/O™ product family. It provides 4 digital inputs and 3 relay outputs for Siemens building automation systems, mainly used with Desigo automation stations for HVAC, room control, and facility automation applications.

Technical Specifications

General Data

Brand: SIEMENS
Model: TXM1.4D3R
Order Number: S55661-J124
Series: TX-I/O™
Type: Digital Input + Relay Output Module
Input Channels: 4 Digital Inputs
Output Channels: 3 Relay Outputs
Communication: TX-I/O bus
Mounting: DIN rail mounting
Protection Class: IP20
Application: Building automation and HVAC control systems

Digital Input Specifications

Digital Inputs

Number of Inputs: 4 channels
Input Type: Voltage-free / dry contact input
Input Functions:
- Status signal monitoring
- Status pulse monitoring
- Counter pulse input
Configurable Functions:
- Normally Open (NO)
- Normally Closed (NC)
- Pulse input
- Counter input
Contact Sensing Voltage: DC 21.5…25 V
Contact Sensing Current: 1.6 mA
Maximum Closed Contact Resistance: 200 Ω
Minimum Open Contact Insulation Resistance: 50 kΩ

Counter function:

Maximum counting frequency: 10 Hz
Counter memory: 32-bit

Relay Output Specifications

Relay Outputs

Number of Outputs: 3 relay outputs
Relay Type: Changeover contact
Output Type: Potential-free relay contact

Supported functions:

ON/OFF switching
Pulse switching
Single-stage control
Three-position actuator control with internal stroke-time calculation

Electrical ratings:

AC Output

Voltage range: AC 12…250 V
Resistive load: Max. 4 A
Inductive load: Max. 3 A (cos φ ≥0.6)

DC Output

Voltage range: DC 12…30 V
Resistive load: Max. 3 A

Communication Interface

TX-I/O Bus

The module communicates through the Siemens TX-I/O bus and integrates with:

Siemens Desigo automation stations
Desigo Room Automation systems
PXC controllers

Functions:

Input signal acquisition
Relay output control
Module identification
Diagnostics
System communication

Electrical Specifications

Parameter	Specification
Operating Voltage	DC 21.5…26 V
Power Consumption	Approx. 1.0 W
Current Consumption	Approx. 42 mA
Protection	Short-circuit and incorrect wiring protection
Input Cable Length	Max. 300 m