Siemens 6ES5420-3BA11 | SIMATIC S5 Digital Input Module

Technical Overview of the Digital Input Module

The Siemens 6ES5420-3BA11 provides 32 digital input channels for the SIMATIC S5 PLC family. This module handles discrete signals from sensors, switches, and other field devices. It converts these signals into logic levels for the central processor. The module supports 24V DC inputs with electrical isolation.

Key Technical Specifications

This section lists the precise parameters for the Siemens 6ES5420-3BA11 input module. Use these specifications to ensure correct system integration.

Parameter	Specification
Part Number	6ES5420-3BA11
Type	Digital Input Module
Product Family	SIMATIC S5
Number of Inputs	32 Digital Inputs
Input Voltage	24V DC
Input Current	Approx. 7 mA per channel
Isolation	Galvanic isolation between channels and backplane
Dimensions (W x H x D)	Approx. 250 x 25 x 180 mm
Weight	Approx. 1.0 kg
Compatibility	SIMATIC S5-115U, 135U, and 155U systems

Application and System Integration

This input module connects directly to the S5 backplane bus. It reads digital signals from pushbuttons, limit switches, and proximity sensors. The Siemens 6ES5420-3BA11 transmits this data to the CPU for processing. Each channel includes an LED indicator for visual status monitoring. Consequently, technicians can quickly diagnose field wiring issues.

Reliability and Performance Characteristics

The galvanic isolation protects the control system from electrical noise. This feature ensures stable operation in industrial environments. The module’s robust construction withstands vibration and temperature variations. Engineers rely on the Siemens 6ES5420-3BA11 for its proven field performance.