Siemens 6ES7421-7BH01-0AB0 | S7-400 Digital Input Module
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Siemens S7-400 Digital Input Module SM 421 - 16 Channel High-Speed Isolated
The Siemens 6ES7421-7BH01-0AB0 is a top-quality digital input module for the SIMATIC S7-400 PLC system. It offers 16 fully isolated channels for 24V DC signals. Key features include ultra-fast 0.05 ms input response, advanced diagnostic functions, and built-in sensor power supply. This module ensures reliable operation in demanding industrial automation environments.
Product Highlights
High-Speed Operation: Configurable input filters for precise timing (0.05, 0.1, 0.5, 3 ms).
Comprehensive Diagnostics: Monitors for wire break, supply voltage faults, and group errors. LEDs show status clearly.
Integrated Sensor Supply: Two 24V DC outputs power connected sensors directly, up to 150 mA total.
Robust & Safe: Features reverse polarity protection, wide voltage range (20.4-28.8V DC), and 500V DC isolation.
Detailed Technical Specifications
Brand: Siemens
Series: SIMATIC S7-400
Full Model Number: 6ES7421-7BH01-0AB0
Module Type: Digital Input (DI)
Input Channels: 16, Isolated (in groups of 8)
Input Voltage Level: 24V DC (Nominal)
Signal "1" (ON): 11V to 30V DC
Signal "0" (OFF): -30V to +5V DC
Input Current: Typical 6-8 mA per point
Response Time: Selectable: 0.05, 0.1, 0.5, or 3 milliseconds
Sensor Power: 2 outputs at L+ (-2.5V), 120 mA rated, short-circuit protected
Power Consumption: Typically 5 W
Cable Length: Up to 1000 m shielded (for 3 ms delay setting)
Dimensions: 25 mm x 290 mm x 210 mm (W x H x D)
Installation & Compatibility Guide
This module plugs directly into any S7-400 PLC rack. It works perfectly with standard 2-wire and 3-wire sensors. For optimal performance with the fastest input delay (0.05 ms), keep cable lengths under 30 meters. Always ensure the external 24V DC power supply is stable and within the 20.4V-28.8V range.
Package Contents & Warranty
Box Includes: 1 x Siemens 6ES7421-7BH01-0AB0 Digital Input Module.
Quality Guarantee: All products come with a solid 12-month warranty for peace of mind.
Global Shipping Options
We ship internationally using major carriers: FedEx, UPS, and DHL for fast and reliable delivery to your facility.
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