Siemens Logo! DM8 24R Expansion module, 24VDC

Product Overview

The LOGO! DM8 24R expansion module is a versatile digital I/O module designed to extend the capabilities of LOGO! 8 logic controllers. This module provides four digital inputs with AC/DC/NPN compatibility and four relay outputs in a compact 2 MW (36 mm) width design, enabling flexible expansion for industrial automation, building control, and process monitoring applications requiring 24V operation.

Key Features

• AC/DC/NPN Input Compatibility: 4 digital inputs supporting 24V AC/DC signals with NPN input capability
• High-Power Relay Outputs: 4 relay outputs with 5A resistive and 3A inductive load switching capacity
• 24V Dedicated Operation: Optimized for 24V systems with supply voltage range 20.4-28.8V
• Compact Design: 2 MW (36 mm) width for space-efficient DIN rail mounting
• Easy Integration: Seamless connection to LOGO! 8 series via integrated slider connection
• No Short-Circuit Protection: Direct relay outputs for maximum switching flexibility

Technical Specifications

• Digital Inputs: 4 channels, 24V AC/DC with NPN input support (0-28.8V range)
• Digital Outputs: 4 relay outputs, SPDT contacts available
• Relay Rating: 5A @ 265V AC (resistive), 3A (inductive), 1000W (lamp load)
• Supply Voltage: 24V AC/DC (operating range: 20.4-28.8V)
• Input Current: 2.63 mA at signal "1"
• Switching Frequency: 2 Hz (resistive), 0.5 Hz (inductive), 10 Hz (mechanical max)
• Module Width: 2 MW (36 mm) for DIN rail mounting
• Operating Temperature: 0°C to +55°C
• Protection Class: IP20
• Physical Dimensions: 36 x 90 x 58 mm (W x H x D)
• Net Weight: 0.166 kg
• Country of Origin: China
• EAN: 4034106029449
• UPC: 887621847494

System Integration & Programming

• Compatibility: LOGO! 8, 8.2, 8.3, and 8.4 series logic modules
• Programming Software: LOGO! Soft Comfort V8.1 and higher versions
• System Expansion: Supports up to 24 digital inputs and 20 digital outputs with multiple modules
• Configuration: Standard digital I/O function blocks with AC/DC input detection
• Connection Method: Tool-free DIN rail mounting with integrated slider connection to base module

Input Signal Characteristics

• Signal Types: 24V AC, 24V DC, and NPN transistor outputs
• Voltage Range: 0 to 28.8V for maximum input flexibility
• Input Detection: Automatic AC/DC signal recognition
• NPN Compatibility: Direct connection to NPN transistor outputs and sensors
• Signal Processing: Fast input response for real-time control applications

Relay Output Specifications

• Contact Configuration: SPDT (changeover contacts) available
• Contact Material: Silver alloy for reliable switching performance
• Load Types: Resistive, inductive, capacitive, and lamp loads supported
• Maximum Ratings: 5A/265V AC resistive, 3A inductive, 1000W tungsten lamp
• Switching Life: High mechanical and electrical endurance for industrial applications

Applications & Use Cases

• 24V Industrial Systems: Motor starters, valve control, and process equipment in 24V environments
• Building Automation: HVAC control, lighting systems, and access control with 24V infrastructure
• Process Control: Pump control, heating systems, and industrial equipment switching
• Machine Control: Production equipment, conveyor systems, and automated machinery
• Sensor Integration: Connection of 24V proximity sensors, limit switches, and safety devices

Installation & Wiring

• Mounting: Standard 35 mm DIN rail mounting, 2 MW width requirement
• Environmental: Indoor use, IP20 protection, controlled environment installation
• Wiring: Screw terminal connections for secure field wiring
• Cable Capacity: 0.2-2.5 mm² wire sizes for reliable connections
• External Protection: Fuses or circuit breakers recommended for relay output protection

Compliance & Safety

• Certifications: CE, UL, CSA, FM, IEC 61131, Marine approval
• RoHS Compliance: Compliant since August 4, 2014
• Export Control: AL: N / ECCN: N
• WEEE Compliance: Subject to WEEE take-back obligations
• REACH Information: Contains lead, lead monoxide, and 6,6'-di-tert-butyl-2,2'-methylenedi-p-cresol in concentrations >0.1% w/w (safe when used as intended)

Diagnostic & Monitoring Features

• LED Status Indicators: Visual indication of input and output status
• Real-Time Monitoring: I/O status monitoring through LOGO! programming software
• Signal Diagnostics: Input signal detection and validation capabilities
• System Integration: Seamless integration with LOGO! diagnostic functions

Download existing graphical data for this product:

• Product Datasheet
• Technical Documentation
• LOGO! 8 System Manual
• LOGO! Soft Comfort Manual
• Product Support Page