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Product Name: SIMATIC S7-400 SM 421 Digital Input Module
Brand Name: Siemens
Model Number: 6ES7421-7BH01-0AB0
Place of Origin: Germany
Warranty: 12 Months
Whatsapp：+86 18020776782
Email：[email protected]
Sales |
Phone/Whatsapp |
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Jim Pei |
| Product Name | Siemens 6ES7421-7BH01-0AB0 SIMATIC S7-400 SM 421 Digital Input Module |
| Manufacturer | Siemens |
| Product Type | SIMATIC S7-400 SM 421 Digital Input Module |
| Part Number | 6ES7421-7BH01-0AB0 |
| Weight | 0.6kg |
| Estimated shipping dimensions | 23x22.3x28.8cm |
| Place of shipment | Xiamen, China |
| Country of origin | Germany |
| Product Family | SIMATIC S7-400 |
| Product Type | Digital Input Module |
| Module Designation | SM 421 |
| Number of Digital Inputs | 16 |
| Input Type | DC, Galvanically Isolated |
| Rated Input Voltage | 24 VDC |
| Permissible Load Voltage Range | 20.4–28.8 VDC |
| Signal “0” Input Voltage | -30 to +5 VDC |
| Signal “1” Input Voltage | 11 to 30 VDC |
| Typical Input Current at Signal “1” | 6 mA (6–8 mA) |
| Simultaneously Controllable Inputs | 16 at up to 60°C |
| Input Delay | Parameterizable: 0.05 / 0.1 / 0.5 / 3 ms |
| Maximum Backplane Bus Current @ 5 VDC | 130 mA |
| Maximum Current from Supply Voltage L+ | 120 mA |
| Maximum Power Loss | 5 W |
| 2-Wire Sensor Support | Yes |
| Maximum 2-Wire Sensor Quiescent Current | 3 mA |
| Diagnostic Alarm | Yes, Parameterizable |
| Hardware Interrupt | Yes, Parameterizable |
| Diagnostics | Yes, Internal / External Fault |
| Galvanic Isolation Between Channels | Yes, Groups of 8 |
| Galvanic Isolation to Backplane Bus | Yes |
| Isolation Test Voltage | 500 VDC |
| Maximum Shielded Cable Length | 1,000 m at 3 ms Input Delay |
| Maximum Unshielded Cable Length | 600 m at 3 ms Input Delay |
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Minimum Order Quantity |
1 Piece |
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Price |
Contact for Jim |
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Packaging Details |
Original new Factory Sealed |
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Delivery Time |
3–7 Days |
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Payment Terms |
T/T |
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Shipping Method |
DHL / FedEx / UPS / TNT |
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Supply Ability |
In stock |
The Siemens 6ES7421-7BH01-0AB0 is a SIMATIC S7-400 SM 421 Digital Input Module designed for reliable acquisition of discrete field signals in industrial automation and process control systems. It provides galvanically isolated digital inputs with configurable response times, diagnostic alarms, and hardware interrupt capability for accurate monitoring of sensors and switching devices. The 6ES7421-7BH01-0AB0 is well suited for manufacturing, process automation, machine control, distributed plant monitoring, S7-400 I/O expansion, and maintenance of existing Siemens PLC systems.
Years of Global Experience: With over 10 years of experience in the industrial automation industry, we serve customers worldwide and have built long-term business relationships with clients across many countries and regions, including the United Kingdom, Russia, the United Arab Emirates, India, Venezuela, and more.
Professional Support Team: Our experienced team provides helpful pre-sales consultation and reliable after-sales support, helping customers select suitable products and solve purchasing concerns.
Wide Range of Brands: We supply products from many leading automation brands, covering PLCs, DCS, I/O modules, drives, motors, power supplies, communication modules, and more.
Large In-Stock Inventory: A wide selection of automation components is available from stock, including discontinued, obsolete, and hard-to-find parts, helping customers reduce sourcing time.
Honesty & Trust: We believe long-term cooperation begins with sincerity. We treat every customer with honesty, respect, responsibility, and genuine care.
Your Trusted Automation Partner: Whether you need a single replacement part, discontinued components, or products for a complete automation project, we are ready to support your needs and build a long-term partnership.
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☑ The highest quality product.
☑ Most products have a warranty period of up to one year, and any quality issues will be refunded at our expense. Each item undergoes rigorous testing before delivery.
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