Siemens 6ES7521-1BH00-0AB0 – S7-1500 Digital Input Module (16 × DI, 24 V DC)

The Siemens 6ES7521-1BH00-0AB0 is a digital input module designed for the SIMATIC S7-1500 automation platform. It provides 16 digital inputs at 24 V DC, offering high-speed and reliable signal acquisition for industrial control systems. With robust diagnostics, stable performance and seamless CPU integration, it is ideal for medium and large automation projects requiring precise input handling.

Key features and benefits

• 16 × digital inputs, 24 V DC

• Fast signal processing for dynamic applications

• Integrated channel-level diagnostics

• LED status indicators for each input

• Noise-immune industrial design

• Direct backplane connection to S7-1500 rack

• Compatible with all S7-1500 CPUs

• Compact, efficient module width

Typical applications

• Machine and production line control

• Conveyor and material handling systems

• Industrial process automation

• Monitoring of sensors, switches and field devices

• Medium and large PLC installations requiring high DI density

About the manufacturer

Siemens is one of the world’s most trusted industrial automation manufacturers, known for high-performance PLCs, HMI systems, I/O modules and drives.
The SIMATIC S7-1500 series is Siemens’ flagship automation platform, offering exceptional speed, reliability and diagnostic capabilities. Siemens components are engineered for long-term operation in demanding environments, ensuring stable control and easy scalability for modern industrial systems