Siemens 6ES7421-7BH00-0AB0 Digital Input Module

High-Density Digital Input for S7-400 Systems

The Siemens 6ES7421-7BH00-0AB0 functions as a high-density digital input module for the SIMATIC S7-400 series. This module provides 16 digital inputs with electrical isolation for robust signal acquisition. It supports 24 V DC nominal voltage and processes signals from field devices such as switches and sensors. The module offers a high level of immunity against electromagnetic interference, ensuring reliable operation in industrial environments. It features a compact design that optimizes rack space while delivering comprehensive input processing capabilities.

Technical Specifications

Specification	Value
Model	6ES7421-7BH00-0AB0
Product Type	Digital Input Module
Number of Inputs	16
Input Voltage	24 V DC (nominal)
Input Current	6 mA
Isolation	Electrical isolation
Dimensions (W x H x D)	25 mm x 290 mm x 210 mm
Weight	Approx. 0.65 kg
Ambient Temperature	0 °C to 60 °C
Storage Temperature	-40 °C to 70 °C
Vibration Resistance	5 Hz to 9 Hz constant amplitude

Signal Processing and Diagnostics

The Siemens 6ES7421-7BH00-0AB0 processes signals with a typical input delay of 3 ms for fast response times. It features built-in diagnostics for wire break detection and short circuit monitoring. The module consumes approximately 50 mA from the backplane bus. Its electrical isolation provides 500 V AC between channels and the backplane, enhancing system protection.