Communication Module | Siemens | 6ES7521-1BH00-0AB0 S7-1500 digital input module 6ES7 521-1BH00-0AB0

Product Description: Siemens 6ES7521-1BH00-0AB0

The Siemens 6ES7521-1BH00-0AB0 is a high-feature digital input module from the SIMATIC S7-1500 series, providing 16 digital input channels for 24 V DC signals. Designed for high-performance industrial automation, this module supports extensive diagnostics, fast input response, and configurable filtering. With its high-feature capabilities, it allows for greater precision, reliability, and flexibility in demanding digital input applications. Configuration is performed via TIA Portal (STEP 7 Professional).

Key Features

• Digital Inputs: 16 channels, 24 V DC
• Input Type: Sourcing (PNP)
• Diagnostics: Channel-specific diagnostics for wire break, short circuit, and status
• Advanced Features: Parameterizable input delay, substitute values, isochronous mode support
• Protective Functions: Electronic protection with diagnostic feedback
• Mounting: DIN rail on S7-1500 system rack
• Configuration: Via TIA Portal (STEP 7 Professional V13 or higher)

Technical Specifications

• System Series: SIMATIC S7-1500
• Module Type: Digital Input Module (High Feature)
• Number of Inputs: 16
• Input Voltage: 24 V DC
• Input Type: PNP (sourcing)
• Input Delay: Configurable (0.05–20 ms)
• Diagnostics: Yes (channel-specific)
• Mounting Type: DIN rail (S7-1500 rack)
• Dimensions (W × H × D): 35 mm × 147 mm × 129 mm
• Operating Temperature Range: 0 °C to +60 °C
• Protection Class: IP20
• Certifications: CE, cULus, RCM, KC

Application Areas

• High-precision machine control requiring fast input response
• Industrial environments with detailed diagnostics needs
• Scalable I/O architectures in advanced automation systems
• Integration into safety- or quality-critical production lines

Advantages

• High input density in a compact form factor
• Extensive diagnostics improve system transparency and maintenance
• Supports fast and isochronous data acquisition
• Seamless integration with TIA Portal for efficient configuration