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Product description

Siemens 6ES7421-7BH01-0AB0 is a SIMATIC-S7-400 digital input module for fast 24-V-DC signals in installed automation systems. The card provides 16 electrically isolated digital inputs with IEC 61131 Type 2 characteristics. A configurable input delay beginning at 0.05 ms, diagnostic interrupts and hardware interrupts support demanding machine functions and rapid fault detection. The load supply L+ is 24 V DC, with an admissible range from 20.4 to 28.8 V. Current consumption is limited to 120 mA from L+ and 130 mA from the backplane bus, while typical power loss is 5 W. Two short-circuit-proof sensor supplies provide 120 mA each for connected field devices. Channels are electrically isolated in groups of 8 and from the backplane bus, helping separate field wiring within the rack. Diagnostic LEDs for the supply and internal or external faults assist troubleshooting in the control cabinet. Siemens 6ES7421-7BH01-0AB0 is particularly relevant where a fast 16-channel input card with diagnostics must be restored in an existing S7-400 configuration. Before replacement, compare the complete type code, input characteristics, delay settings, interrupt configuration, sensor supply, slot and STEP 7 hardware configuration. The signal type and response time must match the existing project. Siemens 6ES7421-7BH01-0AB0 remains a type-specific S7-400 input module.

Siemens 6ES7421-7BH01-0AB0 SIMATIC S7-400 SM 421

Specifications

Manufacturer Siemens
Product series SIMATIC S7-400
Module type SM 421 digital input
Type code 6ES7421-7BH01-0AB0
Number of digital inputs 16
Input voltage 24 V DC
Admissible voltage range 20.4 to 28.8 V DC
Input characteristic IEC 61131 Type 2
Input delay 0.05 / 0.1 / 0.5 / 3 ms configurable
Current consumption from L+ max. 120 mA
Backplane-bus current max. 130 mA at 5 V DC
Sensor supply 2 outputs, 120 mA each
Diagnostic function Yes
Hardware interrupt Configurable
Electrical isolation Channels in groups of 8 and from the backplane bus
Power loss typ. 5 W
System family S7-400
Control cabinet with PLC modules and automation components
Machine downtime in a production environment

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Product safety

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FAQ

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Is there a warranty?

Yes. We provide a 14-day functional warranty for used items. The component must be functional on arrival, and the warranty applies only while the warranty seal remains undamaged. If a fault occurs within 14 calendar days, please contact us in writing. Depending on availability, we will either provide a replacement or refund the full purchase price after the item has been returned. Further details are set out in the terms and conditions supplied with our quotation.

How quickly do you ship, and which shipping options are available?

We normally dispatch available items immediately and, in many cases, on the same working day. For urgent requirements or machine downtime, we will identify the fastest suitable option and can confirm a specific delivery window on request. Express shipping and collection from our premises are also possible by arrangement. We ship worldwide using reliable parcel and freight carriers; freight shipments may require additional preparation to ensure safe delivery.

Is there a guarantee?

Yes, we provide a 14-day functional guarantee for used items. This means the component must be operational when received.

Please note that the guarantee only applies when the warranty seal is undamaged.

If a defect occurs within 14 calendar days, please contact us in writing. Subject to availability, we will provide a replacement or refund the full purchase price after return.

Further details are provided in the terms and conditions supplied with your quotation.

How quickly do you dispatch and which shipping options are available?

We generally dispatch immediately - in many cases on the same working day. For particularly urgent requirements or machine downtime, we find a suitable solution as quickly as possible and provide a specific delivery window on request.

Express shipping or collection from our premises is also possible, depending on the situation. State your requirements during the ordering process or contact us directly.

We ship worldwide and work with reliable shipping partners, from parcel services to freight forwarding. Freight shipments normally require some preparation so the goods arrive safely and undamaged.

Which payment methods are available?

Payment is normally made by bank transfer against invoice. Payment is due within 10 calendar days of receiving the goods.

As a rule, we offer purchase on account for all customers. In individual cases, such as new customers or particularly high-value components, we may agree advance payment. This decision is made individually and communicated transparently.

Can we return items if they were ordered incorrectly?

Because we sell exclusively to business customers (B2B), there is no general right of return and no consumer right of withdrawal.

Please note that returns of functioning goods are generally excluded. In justified exceptional cases, we can assess an individual solution, but this is not the standard procedure.

Is there a discount when ordering several items?

For larger order quantities or several items of one type, we can offer individual discounts.

Simply send us a quick enquiry - we check availability and will gladly prepare a tailored quotation with quantity pricing.

Do you also purchase industrial spare parts?

Yes, we also purchase automation components, such as frequency inverters, PLC assemblies, panels, servo motors and CPUs. Components from Siemens, Lenze, Schneider Electric, Control Techniques or Heidenhain are especially sought after, and other brands are also possible.

The process is straightforward: email us an inventory list or overview photos at info@reha-industriekomponenten.de. We calculate a market-based purchase price and send you an offer.

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