Siemens Simatic S7-400, Digital output SM 422, 24VDC, 0.5A

Product Overview

The SIMATIC S7-400 digital output module SM 422 with isolated 32 digital outputs provides reliable interface between the S7-400 controller and field devices.

This module delivers precise control signals to external devices such as solenoid valves, contactors, low-power motors, lamps, and motor starters in industrial automation applications

Key Features

• High-Density Output Configuration: Features 32 isolated digital outputs in a compact form factor, maximizing I/O density while maintaining reliable operation
• Optical Isolation: Each output is optically isolated, providing excellent electrical isolation between the controller and field devices to prevent ground loops and enhance system safety
• Robust Current Capability: Each output channel supports up to 0.5 A current rating at 24 V DC, suitable for driving various industrial loads including contactors and solenoid valves
• Hot-Swappable Design: Supports hot-swapping during operation, allowing module replacement without shutting down the entire system, minimizing downtime during maintenance
• Diagnostic Capabilities: Integrated diagnostic functions provide real-time monitoring of output status, enabling proactive maintenance and system troubleshooting
• Screw/Spring Clamp Connections: Offers flexible connection options with both screw-type and spring clamp terminals for secure and reliable field wiring

Technical Specifications

• Output Configuration: 32 isolated digital outputs
• Supply Voltage: 24 V DC
• Output Current: 0.5 A per channel
• Isolation: Optical isolation between channels and logic
• Time Delay: 1 ms signal exchange delay
• Connection Type: Screw/spring clamp connection
• Switching Frequency: Up to 100 Hz with resistive load
• Net Weight: 0.774 kg
• Physical Dimensions: 290 mm (H) x 25 mm (W) x 210 mm (D)
• Packaging Dimensions: 23.30 x 30.00 x 3.80 cm
• Country of Origin: Germany
• EAN: 4025515128946
• UPC: 662643183610

Compliance & Certifications

• RoHS Compliance: Compliant with RoHS directive since March 1, 2008
• WEEE Compliance: Subject to WEEE take-back obligations
• Export Control: AL: N / ECCN: 9N9999
• ATEX Classification: Gas explosion safety category 3G
• Safety Category: Suitable for industrial automation applications

REACH Regulation Information

• This product contains substances from the REACH candidate list in concentrations higher than 0.1% w/w:
  • Lead
  • Lead monoxide (lead oxide)
  • Tris(4-nonylphenyl, branched and linear) phosphite (TNPP)
• These substances are considered safe when used as intended according to product documentation

Product Lifecycle

• Status: PM300 Active Product
• Phase-out Notice: Product phase-out scheduled since October 1, 2025

Applications

• Industrial process control systems requiring reliable digital outputs
• Manufacturing automation with solenoid valve control
• Motor starter control and contactor operation
• Lighting control systems in industrial environments
• Machine control applications requiring isolated outputs
• Systems requiring diagnostic feedback for preventive maintenance

System Integration

• Controller Compatibility: Designed specifically for SIMATIC S7-400 automation systems
• PROFIBUS DP Support: Can be connected via PROFIBUS DP for distributed I/O applications
• Centralized/Distributed Operation: Supports both centralized and distributed I/O configurations
• Modular Design: Integrates seamlessly with other S7-400 signal modules and system components

Installation & Maintenance

• Easy Installation: Standard S7-400 module mounting with secure mechanical connection
• Front Connector System: Uses front connector for simplified wiring and maintenance
• Module Replacement: Hot-swappable design allows replacement during operation
• Diagnostic Access: Built-in diagnostics accessible through STEP 7 programming software

Connection Capabilities

• Cable Length: Up to 600 m unshielded, 1000 m shielded
• Load Types: Suitable for resistive and inductive loads
• Output Protection: Built-in protection against short circuits and overloads
• Group Isolation: Multiple supply groups for flexible power distribution

Download existing graphical data for this product:

• Product Datasheet
• Technical Documentation
• S7-400 Reference Manual
• Product Support Page