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Siemens 6ES7521-1BH00-0AB0 SIMATIC S7-1500 Digital Input Module
The Siemens 6ES7521-1BH00-0AB0 is a SIMATIC S7-1500 DI 16×24 V DC HF digital input module with 16 digital inputs for acquiring 24 V DC signals from sensors, switches, and other field devices. It provides high-speed signal acquisition with a parameterizable input delay from 0.05 to 20 ms, while two of the inputs can also be configured for counter functions up to 6 kHz. The module is designed for demanding industrial automation applications requiring flexible digital input processing and fast response.
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Categories: PLC I/O Modules
Description
The Siemens SIMATIC S7-1500 DI 16x24VDC HF provides 16 digital inputs arranged in one group of 16 for processing standard 24 V DC field signals. The inputs support the IEC 61131 Type 3 input characteristic, with a signal “0” recognized from −30 to +5 V and a signal “1” from +11 to +30 V. The input delay is configurable to 0.05, 0.1, 0.4, 1.6, 3.2, 12.8, or 20 ms, allowing the module to be optimized for different switching and signal-processing requirements. Two inputs can additionally be used as counters, with a maximum counting frequency of 6 kHz, while the module also supports gate start/stop and freely usable digital input functions.
The module provides advanced S7-1500 functionality including I&M0 to I&M3 data, isochronous operation, prioritized startup, MSI, diagnostic alarms, and hardware interrupts. It supports shielded field cables up to 1,000 m and unshielded cables up to 600 m, allowing flexible installation in industrial environments. Diagnostic capabilities include supply-voltage monitoring and wire-break detection, with RUN, ERROR, PWR, channel-status, and diagnostic LEDs providing clear operating information. Its 35 × 147 × 129 mm housing is designed for S7-1500 installations, with an operating temperature range up to 60°C horizontally and a maximum installation altitude of 5,000 m subject to Siemens restrictions above 2,000 m.
QTech Safety is a leading supplier of Siemens 6ES7521-1BH00-0AB0 SIMATIC S7-1500 Digital Input Module in Ireland, offering competitive prices and fast worldwide shipping across United Kingdom (UK), Germany, France, Italy, Spain, United States USA, Canada, Mexico, and Western Australia (Perth). Buy Siemens PLC I/O Modules from one of Ireland’s most trusted industrial safety equipment suppliers.
Features of Siemens 6ES7521-1BH00-0AB0 SIMATIC S7-1500 Digital Input Module
- SIMATIC S7-1500 DI 16×24 V DC HF digital input module.
- Provides 16 digital inputs.
- Supports 24 V DC field signals.
- Uses IEC 61131 Type 3 input characteristics.
- Supports parameterizable input delays from 0.05 to 20 ms.
- Two inputs can be used as high-speed counters.
- Supports counter frequencies up to 6 kHz.
- Supports gate start/stop functions.
- Supports freely usable digital input functions.
- Supports MSI functionality.
- Supports isochronous operation.
- Supports prioritized startup.
- Provides hardware interrupts.
- Provides diagnostic alarms.
- Supports supply-voltage monitoring.
- Supports wire-break detection.
- Provides individual channel-status indication.
- Supports shielded cables up to 1,000 m.
- Supports unshielded cables up to 600 m.
- Supports I&M0 to I&M3 identification data.
- Suitable for high-speed machine and process automation applications.
Technical Specifications of Siemens 6ES7521-1BH00-0AB0
- Product Type: DI 16×24 V DC HF
- Product Family: SIMATIC S7-1500 digital input modules
- Article Number: 6ES7521-1BH00-0AB0
- Number of Digital Inputs: 16
- Input Type: Digital, P-reading
- Rated Input Voltage: 24 V DC
- Permissible Supply Voltage: 19.2–28.8 V DC
- Signal 0 Input Voltage: −30 to +5 V DC
- Signal 1 Input Voltage: +11 to +30 V DC
- Input Current at Signal 1: 2.5 mA typical
- Input Characteristic: IEC 61131 Type 3
- Input Delay: 0.05 / 0.1 / 0.4 / 1.6 / 3.2 / 12.8 / 20 ms
- Digital Inputs Parameterizable: Yes
- Counter-Capable Inputs: 2
- Maximum Counting Frequency: 6 kHz
- Isochronous Mode: Yes
- MSI: Yes
- Prioritized Startup: Yes
- I&M Data: I&M0 to I&M3
- Diagnostics: Yes
- Diagnostic Alarm: Yes
- Hardware Interrupt: Yes
- Wire-Break Detection: Yes
- Supply-Voltage Monitoring: Yes
- Shielded Cable Length: 1,000 m max.
- Unshielded Cable Length: 600 m max.
- Power Consumption from Backplane Bus: 1.1 W
- Power Loss: 2.6 W typical
- Degree of Protection: IP20
- Operating Temperature: −30°C to +60°C horizontal; −30°C to +40°C vertical
- Maximum Installation Altitude: 5,000 m, with restrictions above 2,000 m
- Dimensions (W × H × D): 35 × 147 × 129 mm
- Weight: Approx. 240 g
- Certifications/Approvals: EU declaration of conformity, approvals for hazardous locations, and applicable Siemens product certificates
Applications
The Siemens 6ES7521-1BH00-0AB0 SIMATIC S7-1500 Digital Input Module is commonly used in:
- High-speed sensor monitoring
- Machine-state detection
- Counter and pulse-counting applications
- Proximity and limit-switch monitoring
- Production-line automation
- Conveyor and material-handling systems
- Digital alarm and interlock monitoring
- S7-1500 machine and process automation
Why Choose QTech Safety?
At QTech Safety, we’re more than just a safety supplier we’re your trusted partner in workplace protection and compliance.
Here’s why companies across UK and Ireland (EU) choose us for safety products and training:
- Comprehensive Range of Safety Equipment:
From gas detection and PPE to industrial safety tools, we offer one of the widest selections of trusted brands all at competitive Irish market prices. - Test & Measurement Instruments You Can Trust:
We supply a wide range of test and measurement instruments from the most leading and trusted brands, including industrial sensors, multimeters, oscilloscopes, accelerometers, proximity sensors, and other advanced measurement tools to support accurate diagnostics, condition monitoring, calibration, and maintenance applications. - Expert Health & Safety Training:
We provide professional health and safety training programmes designed to help your workforce stay compliant and confident on the job. - Fast, Reliable Delivery Worldwide:
Whether you’re in Texas United States or Perth Western Australia, our fast delivery service ensures you get your safety equipment quickly and efficiently. - Trusted by European Businesses:
We’re proud to support industries across Europe (UK) with certified safety solutions, expert advice, and responsive customer service.
We Ship Worldwide
At QTech Safety, we supply industrial sensors and instrumentation across Ireland, offering fast and reliable worldwide delivery. Through strong global logistics partnerships, we ensure efficient shipping and professional support for customers in Europe, North America, and Australia.
🡆 Europe (United Kingdom, Ireland, Germany, France, Italy, Spain, and the rest of European Union)
🡆 Australia (Western Australia WA, Queensland QLD, and New South Wales NSW)
🡆 North America (United States, Canada, Mexico)
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