Product Summary

Siemens 6ES7521-1BH00-0AB0 is a DI 16x24 V DC HF digital input module for the SIMATIC S7-1500 / SM 521 platform. It is intended for industrial automation projects that require a precisely matched Siemens order number, documented signal configuration and reliable maintenance planning. The module supports 16 channels in one group of 16; two inputs usable as counters. Procurement teams should use the complete part number rather than a shortened family name. Before ordering, confirm the installed hardware and firmware status, connector or BaseUnit arrangement, engineering project, field wiring and required operating functions. Availability is quotation-based, and the supplied condition and one-year warranty will be confirmed in writing.

Key Product Information

High-Feature Digital Signal Acquisition

The SM 521 module acquires 24 V DC field signals for an S7-1500 station and provides configurable input filtering, diagnostics and hardware-interrupt functions. Two inputs can also be assigned as counters. The front connector is ordered separately, so connector type and existing cabinet wiring must be reviewed before procurement.

Technical Data Summary

Applications

• S7-1500 machine and production-line control
• High-feature 24 V DC sensor acquisition
• Counter input applications within the module limits
• Diagnostic input monitoring in control cabinets
• Maintenance replacement of SM 521 DI 16x24 V DC HF

Compatibility and Revision Notice

Match the complete order number 6ES7521-1BH00-0AB0. Review front connector, firmware, configured input delay and counter assignment. Similar family names or channel counts do not prove interchangeability. Send the original product-label and cabinet photographs when requesting a compatibility review.

Procurement Checklist

1. Complete order number and hardware function status
2. Firmware and TIA Portal project requirements
3. Front connector type and terminal method
4. Input grouping, delay and counter configuration
5. Available installation space and field wiring

Frequently Asked Questions

Is 6ES7521-1BH00-0AB0 currently available?
Availability changes. Send the exact part number and quantity for confirmation.

What condition is supplied?
The requested condition is NEW and will be stated in the written quotation.

How should compatibility be checked?
Review front connector, firmware, configured input delay and counter assignment against the installed system and engineering project.

Can product and label photos be provided?
Available overall and label images can be confirmed before dispatch when requested.

What warranty is provided?
The quotation will state the applicable one-year warranty terms and return procedure.

Can this item be shipped internationally?
Worldwide shipping options depend on destination, packing, weight and agreed trade terms.