Product Overview

SIMATIC S7-1200 Digital Input Module SM 1221 - A high-performance 16-channel digital input module designed for industrial automation applications. This versatile input module provides comprehensive 24V DC signal monitoring capabilities with flexible Sink/Source configuration, making it ideal for expanding the digital input capabilities of S7-1200 controllers in demanding industrial environments.

Key Features

16 Digital Inputs - Provides 16 independent digital input channels organized in groups of 4 for comprehensive signal monitoring

24V DC Operation - Operates on standard 24V DC input voltage with robust signal processing capabilities

Sink/Source Configuration - Features flexible Sink/Source input capability for compatibility with various sensor types and wiring configurations

Advanced Protection - Equipped with comprehensive protection features and integrated diagnostics for reliable operation

Input Delay Adjustment - Allows input delay adjustments to optimize response time for different application requirements

Compact Design - Space-efficient module design with dimensions optimized for DIN rail mounting in industrial control cabinets

Technical Specifications

Input Voltage: 24V DC
Input Type: Digital inputs with Sink/Source capability
Number of Inputs: 16 (organized in groups of 4)
Input Configuration: Sink/Source
Signal Processing: Digital signal level conversion
Protection Features: Advanced input protection and diagnostics
Mounting: DIN rail compatible
Dimensions: 90mm (W) x 109mm (H) x 60mm (D)
Net Weight: 0.190 kg
Country of Origin: Germany

Signal Conversion & Function

The SM 1221 digital input signal modules convert the level of external digital signals from the process into the internal signal level required by the S7-1200 controller. This ensures seamless integration between field devices and the control system while maintaining signal integrity and reliability.

Compliance & Certifications

RoHS Compliance - Fully compliant with RoHS directive since March 15, 2013
Export Control: AL: N / ECCN: N
WEEE Compliance - Subject to take-back obligation under WEEE directive (2012/19/EU)
Product Class: A - Standard product, stock item with return capability

REACH Regulation Information

This product contains controlled substances including Lead, Lead monoxide (lead oxide), and Bisphenol A (BPA) in concentrations higher than 0.1% weight by weight. Based on current information, these substances do not pose risk when used as intended, including disposal. Please refer to product documentation for complete details.

Applications

Perfect for industrial automation systems requiring comprehensive digital input monitoring including:

• Sensor signal monitoring and processing
• Switch and pushbutton input handling
• Process status monitoring
• Safety system inputs
• Manufacturing automation control
• Building automation systems
• Machine control applications

System Integration

Designed for seamless integration with SIMATIC S7-1200 controller systems (except CPU 1211C) to provide flexible adaptation to specific application requirements. The module supplements the onboard I/O capabilities of S7-1200 CPUs and enables subsequent system expansion with additional inputs.

Compatibility

Compatible with TIA Portal programming environment and supports advanced diagnostic capabilities for efficient system monitoring and troubleshooting. The fine-granular expansion capability saves space in control cabinets while optimizing hardware investment.

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