Siemens Simatic S7-1500 Digital input module, 16DI x 24VDC Part number 6ES7521-1BH00-0AB0

Product Overview

The 6ES7521-1BH00-0AB0 is a SIMATIC S7-1500 digital input module DI 16x24VDC HF featuring 16 high-frequency digital input channels organized in one group of 16, with 2 inputs configurable as counters. This advanced module offers variable input delay (0.05-20ms), Input Type 3 according to IEC 61131, comprehensive diagnostics, and hardware interrupt capabilities, making it ideal for high-speed digital signal acquisition and counting applications in a compact 16-channel configuration.

Key Features

• Input Channels: 16 digital inputs for 24VDC signals with high-frequency capability
• Counter Function: 2 inputs can be used as high-speed counters
• Channel Grouping: 16 channels organized in 1 group of 16
• Variable Input Delay: Configurable 0.05-20ms input delay for optimal signal processing
• Input Type: Type 3 according to IEC 61131 standard for fast switching
• High-Frequency Performance: Optimized for rapid signal changes and pulse counting
• Hardware Interrupts: Configurable interrupt generation for critical signal changes
• Comprehensive Diagnostics: Advanced diagnostic functions for input monitoring
• Status Indication: LED indicators for channel status and diagnostics
• Compact Design: 16-channel density in standard S7-1500 form factor
• Operating Temperature: -30°C to +60°C (horizontal), -30°C to +40°C (vertical)
• Dimensions: 35mm W x 147mm H x 129mm D
• Weight: 0.277 kg

Technical Specifications

• Rated Input Voltage: 24VDC
• Input Voltage Range: 11-30VDC (extended range)
• Input Current: Typical 7mA at 24VDC
• Input Delay: 0.05-20ms (configurable)
• Channel Configuration: 16 channels in 1 group of 16
• Counter Channels: 2 channels configurable as high-speed counters
• Input Type: Type 3 according to IEC 61131
• Switching Frequency: High-frequency capability for fast signals
• Signal Recognition: 0VDC (Low), 24VDC (High)
• Isolation: Galvanic isolation between input circuits and backplane
• Response Time: 0.05ms minimum for high-speed applications
• Maximum Count Frequency: Suitable for RPM measurement up to 3150 RPM

Applications

The DI 16x24VDC HF module is specifically designed for medium-density, high-speed digital signal acquisition and counting applications. Ideal for encoder feedback, RPM measurement, pulse counting, high-frequency sensor monitoring, position detection, and applications requiring precise timing and fast signal processing in space-constrained installations.

Counting and High-Speed Applications

• RPM Measurement: Motor speed monitoring and control feedback
• Encoder Feedback: Position and velocity feedback systems
• Production Counting: Part counting and production rate monitoring
• Flow Measurement: Pulse-based flow meter integration
• Event Detection: High-frequency event counting and monitoring
• Position Control: Precise position feedback and control
• Batch Processing: Accurate counting for batch operations

Advanced Features

• Configurable Input Delay: Optimized signal processing for different applications
• Hardware Interrupt Support: Real-time response to critical signal changes
• Counter Functionality: Built-in high-speed counter capability for 2 channels
• Diagnostic Coverage: Comprehensive fault detection and status reporting
• Signal Integrity: Excellent noise immunity and signal stability
• Flexible Configuration: Adaptable to various signal types and timing requirements
• Medium Channel Density: 16 channels for balanced I/O requirements

Configuration Options

• STEP 7 (TIA Portal): Compatible with current versions for advanced configuration
• GSD File Support: PROFINET IO and PROFIBUS DP compatible
• Input Delay Configuration: Adjustable delay settings per channel/group
• Counter Setup: Configurable counter parameters and limits
• Diagnostic Configuration: Customizable diagnostic functions
• Interrupt Configuration: Hardware interrupt setup and management
• Front Connector Options: Screw terminals or push-in (ordered separately)

Product Information

• Article Number: 6ES7521-1BH00-0AB0
• Net Weight: 0.277 kg
• Packaging Dimensions: 15.00 x 15.10 x 5.00 cm
• EAN: 4025515080138
• UPC: 887621139056
• Country of Origin: Germany
• Product Group: 4501

Compliance & Environmental

• RoHS Compliance: Yes (since 25.02.2013)
• WEEE Take-Back: Yes (2012/19/EU)
• REACH Article 33: Contains lead, lead monoxide, silicic acid lead salt, and Bisphenol A >0.1% w/w
• Export Control: AL: N / ECCN: N
• Product Lifecycle: PM300:Active Product
• Standards Compliance: IEC 61131 (Input Type 3)

Download existing graphical data for this product:

• Equipment Manual - DI 16x24VDC HF
• Technical Datasheet

Additional Resources

• SM 521 Digital Input Modules Product Family
• Siemens Industry Mall