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Siemens 6ES7421-1BL01-0AA0
by Siemens
Read verified buyer reviews ↓OverviewUpgrade your industrial automation capabilities with the Siemens 6ES7421-1BL01-0AA0 Digital Input Module, specifically engineered for seamless integration into the powerful SIMATIC S7-400 PLC series. This essential component is meticulously designed to process digital signals from a diverse range of field devices, guaranteeing unparalleled data accuracy and highly efficient automation control. With its advanced engineering, robust construction, and high-speed signal acquisition, the 6ES7421-1BL01-0AA0 stands as a cornerstone for reliable and responsive industrial control systems. Whether you are upgrading an existing system or implementing a new industrial solution, this Siemens digital input module provides the precision and performance required for demanding operational environments. It's not just a component; it's an investment in the reliability and efficiency of your entire automation infrastructure.Key Features Precise Digital Input: Features 16 meticulously engineered 24V DC digital inputs for accurate signal detection. SIMATIC S7-400 Compatibility: Designed for effortless and perfect integration within Siemens' high-performance SIMATIC S7-400 PLC systems. High-Speed Signal Processing: Ensures rapid and dependable acquisition of digital signals, crucial for time-sensitive applications. Robust Industrial Design: Constructed to withstand the rigors of harsh industrial environments, guaranteeing long-term operational stability. Visual Status Indicators: Integrated LED indicators provide real-time monitoring of input signals, simplifying diagnostics. Effortless Installation: Features DIN rail mounting for quick, secure, and straightforward integration into control cabinets. Optical Isolation: Provides robust protection and signal integrity through optical isolation between inputs and the system bus. Technical Specifications Model: Siemens 6ES7421-1BL01-0AA0 Series: SIMATIC S7-400 Module Type: Digital Input Module Number of Inputs: 16 digital inputs Input Type: 24V DC Rated Voltage: 24V DC Input Current: Approximately 7 mA per channel Isolation: Optical isolation (between inputs and system bus) Response Time: ≤3ms Operating Temperature: 0°C to +60°C Mounting Type: DIN rail or rack mounting Dimensions: Standard S7-400 module size Weight: Approximately 300g Applications Comprehensive Industrial Automation: Indispensable for PLC-based control systems requiring precise digital input signal processing across various sectors. Advanced Machine Control: Ideal for monitoring an array of sensors, limit switches, and other digital signals within complex machinery. Optimized Process Control: Ensures accurate and reliable data acquisition for automated industrial processes, maintaining operational integrity. Large-Scale Factory Automation: Perfectly suited for seamless integration into extensive and sophisticated factory automation infrastructures. Energy Management Systems: Facilitates precise monitoring of digital states in energy generation and distribution systems. Building Management Systems (BMS): Provides reliable input for environmental controls, security systems, and access management. Why Choose This Model? Unmatched Reliability: Built with Siemens' renowned engineering excellence, ensuring stable and long-term performance even in challenging industrial settings. Genuine Siemens Quality: As a genuine Siemens product, the 6ES7421-1BL01-0AA0 guarantees compatibility, performance, and peace of mind with your SIMATIC S7-400 system. Enhanced System Efficiency: High-speed signal processing and accurate data acquisition contribute directly to improved operational efficiency and reduced downtime. Simplified System Integration: Designed for effortless integration into existing and new SIMATIC S7-400 installations, minimizing setup time and complexity. Robust and Resilient: Its durable construction allows it to thrive in harsh industrial environments, offering exceptional longevity and reduced maintenance needs. Order NowInvest in the future of your industrial automation with the Siemens 6ES7421-1BL01-0AA0 Digital Input Module. Contact Palm Parts Solution today to place your order and ensure the continued precision and efficiency of your operations.FAQWhat is the primary function of the Siemens 6ES7421-1BL01-0AA0?This module is a digital input module designed to acquire and process digital signals from various field devices within a SIMATIC S7-400 PLC system, ensuring accurate data for automation control.Is this module compatible with other Siemens PLC series?The 6ES7421-1BL01-0AA0 is specifically engineered for optimal integration with the SIMATIC S7-400 PLC series.What kind of environments can this module operate in?Its robust industrial design makes it suitable for demanding and harsh industrial environments, with an operating temperature range of 0°C to +60°C.How many digital inputs does this module provide?It is equipped with 16 digital inputs, each rated for 24V DC.Does this module offer protection against electrical interference?Yes, it features optical isolation between the inputs and the system bus, providing robust protection and signal integrity.
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Siemens 6ES7421-1BL01-0AA0
Overview
This is a genuine Siemens component from the Siemens PLCs family. PalmPartsSolution stocks it in new, refurbished, and surplus condition with tested warranty and same-day shipping on in-stock units.
Whether you are sourcing a like-for-like replacement for an existing installation, an emergency spare to keep a line running, or a qualified part for a new build, our team can confirm availability, revision, and lead time before you order.
Key Features
- Genuine Siemens catalog part
- Tested before shipment
- Backed by PalmPartsSolution warranty
- Cross-reference and revision assistance available
- Compatible with the broader Siemens automation ecosystem
- Engineered to integrate inside Siemens PLCs installations
Compatibility
When ordering, match the full catalog/part number, hardware revision, and firmware revision called out by your Siemens equipment. Where applicable, confirm:
- Input/output voltage and current rating
- Communication protocol and network role
- Mounting form factor and footprint
- Operating temperature, humidity, and IP rating
- Required certifications (UL, CE, ATEX, marine, etc.)
Not sure which revision you need? Send us the catalog number on the nameplate and we will confirm the correct match.
Replacement Information
Three ways to source this part through PalmPartsSolution:
- Exact replacement — same Siemens catalog number, new or refurbished, tested and warrantied
- Form-fit-function equivalent — alternate revision or build that drops in without code changes
- Engineered migration — current-generation Siemens platform with documented conversion notes for the Siemens PLCs family
Contact our engineering team if you need help choosing between these tracks.
Technical Specifications
- Model: Siemens 6ES7421-1BL01-0AA0
- Series: SIMATIC S7-400
- Module Type: Digital Input Module
- Number of Inputs: 16 digital inputs
- Input Type: 24V DC
- Rated Voltage: 24V DC
- Input Current: Approximately 7 mA per channel
- Isolation: Optical isolation (between inputs and system bus)
- Response Time: ≤3ms
- Operating Temperature: 0°C to +60°C
- Mounting Type: DIN rail or rack mounting
- Dimensions: Standard S7-400 module size
- Weight: Approximately 300g
Applications
- Comprehensive Industrial Automation: Indispensable for PLC-based control systems requiring precise digital input signal processing across various sectors.
- Advanced Machine Control: Ideal for monitoring an array of sensors, limit switches, and other digital signals within complex machinery.
- Optimized Process Control: Ensures accurate and reliable data acquisition for automated industrial processes, maintaining operational integrity.
- Large-Scale Factory Automation: Perfectly suited for seamless integration into extensive and sophisticated factory automation infrastructures.
- Energy Management Systems: Facilitates precise monitoring of digital states in energy generation and distribution systems.
- Building Management Systems (BMS): Provides reliable input for environmental controls, security systems, and access management.
Why Choose the 6ES7421-1BL01-0AA0?
- Unmatched Reliability: Built with Siemens' renowned engineering excellence, ensuring stable and long-term performance even in challenging industrial settings.
- Genuine Siemens Quality: As a genuine Siemens product, the 6ES7421-1BL01-0AA0 guarantees compatibility, performance, and peace of mind with your SIMATIC S7-400 system.
- Enhanced System Efficiency: High-speed signal processing and accurate data acquisition contribute directly to improved operational efficiency and reduced downtime.
- Simplified System Integration: Designed for effortless integration into existing and new SIMATIC S7-400 installations, minimizing setup time and complexity.
- Robust and Resilient: Its durable construction allows it to thrive in harsh industrial environments, offering exceptional longevity and reduced maintenance needs.
Availability & Shipping
- ▸In stock: 6ES7421-1BL01-0AA0 ready for immediate dispatch from our Florida warehouse.
- ▸Free USA shipping: FedEx Priority (2–5 business days) and UPS Ground (3–5 business days). Expedited options available at checkout.
- ▸Worldwide delivery: FedEx International Priority (1–5 days), UPS International Priority (3–5 days), and USPS International (5–10 days) — rates calculated at checkout.
- ▸Bulk pricing: Volume discounts on request — contact our sales team for quantity quotes.
- ▸Buy with confidence: Every 6ES7421-1BL01-0AA0 ships with a 1-Year PALM Parts warranty and a 30-day return window.
Frequently Asked Questions — Siemens
Machine down? We ship parts the same day.
New, surplus, and refurbished Siemens inventory in stock. Request a quote or speak directly with an automation specialist for emergency sourcing.
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Independent Supplier Notice
PALM Parts Solution operates as an independent industrial automation supplier and is not an authorized distributor or affiliate of any listed manufacturer or brand name. Manufacturer trademarks and product names are used solely for identification purposes. Original manufacturer warranties do not apply. All products sold by PALM Parts are backed by our own 1-year warranty.
Product Condition & Firmware
All products are sold as new unless stated otherwise. Original manufacturer packaging may show signs of handling, storage, or shelf wear. Date codes and series may vary from current factory production. PALM Parts does not guarantee the presence, version, or compatibility of any firmware on PLC or automation products.