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- Siemens Simatic S7
- S7-400
- 6ES7421-1BL01-0AA0
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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.
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.
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.
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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Amikon offers a wide range of components, products and services related to industrial automation. We have a large surplus of stocks and are also distributors of new products from a variety of quality manufacturers.
Technical specifications for 6ES7421-1BL01-0AA0
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Product Model6ES7421-1BL01-0AA0
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Product ParametersSIMATIC S7-400, SM 421 DIGITAL INPUT MODULE
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Tariff Code8537101190
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Country of originGermany
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Place of shipmentXiamen, China
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In stock1 unit
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Estimated Shipping Size2.3x22.2x29cm
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ManufacturerSiemens
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Weight0.6 kg
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from backplane bus5 V DC, max. 20 mA
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Power loss, typ.6 W
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Number of digital inputs32
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Isolation tested with500 V DC
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for signal-30 V DC to +5 V DC
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for signal13 V DC to 30 V DC
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shielded, max1 000 m
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unshielded, max600 m
Description
The SIEMENS 6ES7421-1BL01-0AA0 SIMATIC S7-400 SM 421 Digital Input Module is a high-density digital input module for the SIMATIC S7-400 programmable controller platform. It is used to acquire binary signals from field devices and transfer the corresponding ON/OFF status to the S7-400 CPU for use in control logic, sequencing, monitoring, and process automation applications.
The module provides 32 digital input channels, all designed for a nominal 24 V DC signal level. A signal between 13 V DC and 30 V DC is recognized as a logical “1”, while a voltage between -30 V DC and +5 V DC is recognized as a logical “0”. This makes the module suitable for standard industrial 24 V DC control circuits and common binary field devices.
The module provides 32 digital input channels, all designed for a nominal 24 V DC signal level. A signal between 13 V DC and 30 V DC is recognized as a logical “1”, while a voltage between -30 V DC and +5 V DC is recognized as a logical “0”. This makes the module suitable for standard industrial 24 V DC control circuits and common binary field devices.
Information
Overview
Manuals
Application Notes
Product Applications
Important Compatibility Notes
Features:
- 32 inputs can be operated simultaneously
- Suitable for switches and 2-/3-/4-wire proximity sensors
- Input delay: approximately 1.2–4.8 ms
- Suitable for replacement and maintenance of existing S7-400 systems
Each digital input is equipped with a green status LED, allowing the input state to be checked directly during commissioning, operation, and maintenance. The module has an input response delay of approximately 1.2 to 4.8 ms for both signal transitions, making it suitable for standard industrial status monitoring and control applications.
The 6ES7421-1BL01-0AA0 SIEMENS SIMATIC S7-400, SM 421 DIGITAL INPUT MODULE may still be available for purchase and support from Amikon Limited beyond End-Of-Life (EOL) by the manufacturer (OEM).
SIEMENS 6ES7421-1BL01-0AA0 SIMATIC S7-400, SM 421 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.
The 6ES7421-1BL01-0AA0 module features robust galvanic isolation between the field side and the internal logic, with insulation tested at 500 V DC, ensuring safe and stable operation even in environments with significant electrical noise. 6ES7421-1BL01-0AA0 supports a wide input voltage range (20.4 V DC to 28.8 V DC) and recognizes "1" signals from 13 V DC to 30 V DC, while reliably rejecting "0" signals from -30 V DC to +5 V DC.
- Water/Wastewater: Collects pump status, float switch thresholds, and valve feedback
- HVAC/Building: Monitors airflow switches, filter-clog indicators, and damper confirmations
- Maritime: Deployed in vessel monitoring with DNV/Bureau Veritas type approvals
- Conveyor/Handling: Reads proximity/photo-eye signals for track, position, and sorting
- Packaging/Bottling: Processes high-speed sensor feedback for filling, capping, and labeling
This content has been produced using multiple sources.Amikon takes no responsibility for the accuracy of this information. Always consult the original equipment manufacturer for the most up to date instructions and information.
Type 1 vs. Type 2: This module (version -1BL01) replaced the older 6ES7421-1BL00-0AA0 module. The older version used Type 2 characteristics, while the newer -1BL01 uses Type 1.
Sensor Compatibility: Because of the Type 1 characteristics, you should check that older 2-wire proximity switches (BEROs) can operate correctly with 1.5 mA or less in the "0" state.
Software Configuration: The module is supported in STEP 7 V5.1 and higher. For older projects or software, you can configure it using the older module settings without any functional restrictions.
Alternative Names
6ES7421-1BL01-0AAO
6ES7421-1BL01-OAA0
6ES7421-1BL0I-0AA0
6ES7421-1BLO1-0AA0
6ES7421-18L01-0AA0
6ES7421-IBL01-0AA0
6ES742I-1BL01-0AA0
6ES74Z1-1BL01-0AA0
6ES7 421-1BL01-0AA0
6ES7 421-1BL01-0AAO
6ES7 421-1BL01-OAA0
6ES7 421-1BL0I-0AA0
6ES7 421-1BLO1-0AA0
6ES7 421-IBL01-0AA0
6ES7 42I-1BL01-0AA0
6ES7 4Z1-1BL01-0AA0
6ES7421 1BL01 0AA0
6ES7421 1BL01 0AAO
6ES7421 1BL01 OAA0
6ES7421 1BL0I 0AA0
6ES7421 1BLO1 0AA0
6ES742I 1BL01 0AA0
6ES74Z1 1BL01 0AA0
6ES74211BL010AA0
Technical notes
The input module supports cable lengths of up to 1,000 m for shielded cables and 600 m for unshielded cables, subject to the applicable installation conditions. The module has a typical power loss of approximately 6 W and draws a maximum of 20 mA from the 5 V DC backplane bus.
FAQs
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Can I use older proximity switches (BEROs) with this module?
+Yes, connecting 2-wire BEROs is possible, but you must ensure they work correctly with a quiescent current of 1.5 mA or less in the -
How do I configure this module in STEP 7?
+This module is natively supported in STEP 7 V5.1 and higher. If you are using an older STEP 7 version or an existing project, you can simply configure it as the previous model (6ES7 421-1BL00-0AA0) without any functional restrictions. -
What is the difference between 1BL01 and the older 1BL00 module?
+The older 6ES7421-1BL00-0AA0 featured Type 2 characteristics. The newer 1BL01 variant uses pure resistive characteristics matching IEC 61131-2 Type 1. Older proximity sensors (BEROs) must be verified to operate with a quiescent current of 1.5 mA or less in the -
Do I need to change my STEP 7 hardware configuration when replacing a 1BL00 with a 1BL01?
+No. The newer 1BL01 module can be inserted into the physical rack as a direct replacement while leaving the older 1BL00 configured in your project without startup restrictions. It is natively supported in STEP 7 V5.1 and higher.
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