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Product Name: SIMATIC S7-400 SM 421 Digital Input Module
Brand Name: Siemens
Model Number: 6ES7421-7DH00-0AB0
Place of Origin: Germany
Warranty: 12 Months
Whatsapp: +86 18020776782
Email: [email protected]
| Sales | Phone/Whatsapp | |
| Jim Pei | [email protected] | +86 18020776782 |
| Official article number | 6ES7421-7DH00-0AB0 |
| Manufacturer | Siemens AG |
| Product family | SIMATIC S7-400 |
| from backplane bus 5 V DC, max. | 150 mA |
| Power loss, typ. | 8 W; 3.5 W (24 V DC); 6.5 W (48 V DC); 8.0 W (60 V DC) |
| Number of digital inputs | 16 |
| Number of simultaneously controllable inputs | 16 |
| Type of input voltage | AC/DC |
| Rated value (UC) | 24 V; 24 V UC to 60 V UC (47 ... 63 Hz) |
| for signal "0" | -6 to +6 V DC/ 0 to 5 V AC |
| for signal "1" | 15 to 72 V DC; -15 to -72 V DC; 15 to 60 V AC |
| for signal "1", typ. | 4 mA; 4 to 10 mA |
| parameterizable | Yes |
| Rated value | 0.5 ms; 0.5 / 3 / 10 / 20 ms |
| Fixed current limitation for wire-break monitoring, min. | 18 kΩ; 18 kohms: Rated voltage 24 V (15 to 35 V); 39 kohms: Rated voltage 48 |
| Fixed current limitation for wire-break monitoring, max. | 56 kΩ; Rated voltage 60 V (50 to 72 V) |
| shielded, max. | 1 000 m |
| unshielded, max. | 600 m; 600 m: 3, 10, 20 ms; 100 m: 0,5 ms |
| 2-wire sensor | Yes |
| permissible quiescent current (2-wire sensor), max. | 0.5 mA; 0.5 to 2 mA |
| Diagnostics function | Yes; Parameterizable |
| Diagnostic alarm | Yes; Parameterizable |
| Hardware interrupt | Yes; Parameterizable |
| Diagnostic information readable | Yes; possible |
| Wire-break | Yes; I> 0.7 mA |
| Status indicator digital input (green) | Yes |
| Channel fault indicator F (red) | No |
| between the channels | Yes |
| between the channels, in groups of | 1 |
| between the channels and backplane bus | Yes |
| Isolation tested with | 1 500 V AC |
| last modified | 8/30/2023 |
6ES7421-7DH00-0AB0 is a Siemens SIMATIC S7-400 SM 421 Digital Input Module with 16 isolated digital inputs. Its official product data identifies 24-60 V AC/DC input range and alarm and diagnostics support. This Siemens SIMATIC S7-400 product is engineered for dependable integration into compatible industrial automation systems. It supports clear product identification for engineering, replacement, and maintenance workflows. The genuine Siemens article helps users maintain consistent system architecture and organized spare-parts planning. For sourcing and lifecycle support, 6ES7421-7DH00-0AB0 is a precisely identified Siemens industrial automation solution.
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.
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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.
Warranty Support
Most products are covered by a warranty of up to 12 months, subject to the applicable terms and conditions. If any product-related issue occurs during the warranty period, our team will assist you and provide an appropriate solution.
Technical Documentation
Relevant datasheets and technical literature can be provided with the goods, offering useful information for product identification, installation, operation, and maintenance.
Fast Response
We understand the importance of minimizing equipment downtime. Our team responds promptly to inquiries and provides professional assistance with product information, quotations, order status, shipping, and after-sales questions.
Global Customer Service
We serve customers worldwide and provide reliable assistance from inquiry to delivery and after-sales service, ensuring clear and timely communication throughout the process.
Long-term Spare Parts Supply
We continue to source discontinued, obsolete, and hard-to-find automation parts from various brands, helping customers maintain existing equipment and reduce downtime caused by spare parts shortages.
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