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        Siemens 6ES7521-1BL10-0AA0
        Siemens 6ES7521-1BL10-0AA0
        Siemens 6ES7521-1BL10-0AA0
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        Siemens 6ES7521-1BL10-0AA0
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        6ES7521-1BL10-0AA0

        / 4.9
        1001 reviews ｜ Need a Specific Revision?
        The 6ES7521-1BL10-0AA0 is a SIMATIC S7-1500/ET 200MP digital input module with 32 channels, 24V DC, fixed input delay (3-4 ms), and 1000 m shielded cable length.
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
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        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
        Parts Availability
        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for 6ES7521-1BL10-0AA0

        • Manufacturer:
          Siemens
        • Part Number:
          6ES7521-1BL10-0AA0
        • Product Family:
          Siemens Simatic S7-1500
        • Product Type:
          Digital Input Module
        • Number of Channels:
          32
        • Input Voltage:
          24V DC
        • Input Delay (0→1, min./max.):
          3 ms / 4 ms
        • Configurable Input Delay:
          No
        • Cable Length (shielded, max.):
          1000 m
        • 2‑Wire Sensor Permitted Quiescent Current (max.):
          1.5 mA
        • Permitted Potential Difference:
          75 V DC / 60 V AC (basic isolation)
        • Supplied Connector:
          40‑pin push‑in front connector
        • Weight:
          0.28 kg
        • Estimated shipping dimensions:
          3.4x12.5x14.6cm
        • Tariff Code:
          8517795000
        • Country of origin:
          Germany
        • Place of shipment:
          Xiamen, Fujian, China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Specifications Application Performance Application Scenarios

        Features:

        • 32 digital inputs in a 25 mm wide module, saving rack space in S7-1500 and ET 200MP systems.
        • Shielded cable up to 1000 m, unshielded up to 600 m, allowing remote sensor placement.
        • No configurable input delay, no diagnostics, no interrupts – lowest cost entry into 32‑channel digital input for simple applications.
        The 6ES7521-1BL10-0AA0 packs 32 digital input channels into a 25 mm wide module. This high density is a significant advantage for systems with limited rack space. In a typical S7-1500 or ET 200MP rack, every millimeter counts. By providing 32 channels, this module allows engineers to monitor up to 32 field devices – such as pushbuttons, limit switches, proximity sensors, or selector switches – from a single slot. Compared to using four 8‑channel modules or two 16‑channel modules, the 6ES7521-1BL10-0AA0 frees up slots for other I/O types (analog, communication, etc.) and reduces the total system cost. The module is supplied with a 40‑pin push‑in front connector, simplifying wiring.

        The 6ES7521-1BL10-0AA0 supports shielded cable lengths up to 1000 meters and unshielded cable lengths up to 600 meters. This capability is critical for large industrial facilities where sensors are located far from the control cabinet. For example, in a conveyor system spanning hundreds of meters, a water treatment plant with remote valve positions, or a warehouse with distributed photo‑electric sensors, long cable runs are unavoidable. Without proper signal integrity, long cables can introduce voltage drops, noise pickup, and false triggering. The 6ES7521-1BL10-0AA0 is designed to maintain reliable signal detection over these distances.

        The 6ES7521-1BL10-0AA0 is a basic (BA) module, meaning it is intentionally stripped of advanced features to achieve the lowest possible cost. It has no configurable input delay – the delay is fixed at 3‑4 ms for both on and off transitions. It has no diagnostics interrupts, no hardware interrupts, and no channel diagnostics. It cannot detect wire breaks, short circuits, or blown fuses. It does not monitor its own supply voltage. For simple applications where these features are not needed – such as monitoring panel pushbuttons, status contacts from contactors, or simple limit switches – this is perfectly acceptable and cost‑effective.

        The 6ES7521-1BL10-0AA0 Siemens Digital Input Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL)by the manufacturer (OEM).

        Siemens 6ES7521-1BL10-0AA0 Digital Input Module Manuals, Datasheets,Drivers,Link Important Notice:Other accessories,manuals,cables,calibration data,software,etc.are not included with this equipment unless listed in the above stock item description.All prices are shown in USD.
        Siemens 6ES7521-1BL10-0AA0 Digital Input Module Specs

        General

        • Manufacturer Siemens
        • Model 6ES7521-1BL10-0AA0
        • Condition New Original ready stock
        • Product Family 6ES7521-1BL00-0AB0,6ES7521-1BH10-0AA0,6ES7521-1BL01-0AB0
        Important Notice:Other accessories,manuals,cables,calibration data,software,etc.are not included with this equipment unless listed in the above stock item description.All prices are shown in USD.
        • Discrete Manufacturing: Sensor signal acquisition in automotive assembly lines and electronic product production lines.
        • Process Control: Switch status monitoring in food and beverage and pharmaceutical factories.
        • Infrastructure: Water treatment systems, large-scale building automation, and tunnel monitoring.
        • High-density design: Integrates 32 channels within a single module, significantly saving space in the electrical control cabinet's guide rails (only 35mm wide).
        • System integration: Supports PROFINET networks, enabling unified configuration and diagnostics via TIA Portal software, improving engineering development efficiency.
        • Basic (BA) model: Positioned for cost-effectiveness and efficiency, it maintains the high-performance processing capabilities of the S7-1500 series while eliminating complex single-channel diagnostic functions, reducing overall system cost.
        • Mass Sensor Signal Input: When a device has numerous proximity switches, photoelectric switches, or limit switches that need to feed feedback to the PLC, this module can receive signals with maximum efficiency.
        • Distributed I/O Stations: Commonly used as part of the ET 200MP distributed system, communicating with a remote central processor via a bus module, reducing field cabling length.
        • Status Indication Monitoring: Used to collect input signals from button switches, selector switches, and operation panels, enabling real-time processing of manual commands.
        Description
        The 6ES7521-1BL10-0AA0 is a 32‑channel digital input module for SIMATIC S7-1500 and ET 200MP systems. It operates at 24V DC with a fixed input delay of 3 to 4 ms (both on and off). The module supports 2‑wire sensors with a maximum quiescent current of 1.5 mA.

        When using the 6ES7521-1BL10-0AA0, engineers can connect up to 32 field devices such as pushbuttons, limit switches, or proximity sensors. The module has no diagnostics interrupts, no hardware interrupts, and no channel diagnostics.

        The 6ES7521-1BL10-0AA0 offers electrical isolation between channels and the backplane bus (tested at 707 V DC). However, there is no isolation between individual channels – they are isolated in groups of 16. 

        For cost‑sensitive S7-1500 installations, the 6ES7521-1BL10-0AA0 provides a reliable 32‑channel digital input solution.  The module is supplied with a 40‑pin push‑in front connector. It supports prioritized startup but does not support isochronous mode.
        Alternative Names
        6ES7521-1BL00-0AB0 6ES7521-1BH10-0AA0 6ES7521-1BL01-0AB0
        Technical notes
        The 6ES7521-1BL10-0AA0 has a fixed input delay of 3‑4 ms (both on and off). This delay cannot be configured, making the module unsuitable for applications requiring microsecond‑level response times or high‑speed counting.The module provides no diagnostics (wire break, short circuit, supply monitoring) and no hardware or diagnostics interrupts.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        Is the 6ES7521-1BL10-0AA0 a good choice for simple digital input applications?
        Yes. The 6ES7521-1BL10-0AA0 is a basic (BA) module with no diagnostics, no configurable input delay, and no hardware interrupts. It is ideal for cost‑sensitive applications where only standard 24V DC digital inputs are required.
        How far can I place sensors from the 6ES7521-1BL10-0AA0?
        The 6ES7521-1BL10-0AA0 supports shielded cable lengths up to 1000 m and unshielded up to 600 m. This allows sensors to be located far from the control cabinet without signal degradation.
        Can the 6ES7521-1BL10-0AA0 work with 2‑wire sensors?
        Yes. The 6ES7521-1BL10-0AA0 supports 2‑wire sensors with a maximum quiescent current of 1.5 mA. This ensures compatibility with most standard industrial proximity sensors without external pull‑up resistors.
        Are the 32 channels on the 6ES7521-1BL10-0AA0 isolated from each other?
        No. The 6ES7521-1BL10-0AA0 has no isolation between individual channels. Channels are isolated in groups of 16 from the backplane (707 V DC test), but channels within the same group share a common reference.

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