Siemens 6ES5435-7LA11 | 16-Channel Digital Input Module

16-Channel Isolated Input for SIMATIC S5 Systems

The 6ES5435-7LA11 digital input module provides 16 galvanically isolated input channels for the SIMATIC S5 automation platform. This module accepts 24 V DC signals from field devices while maintaining electrical isolation between each channel. It suits applications where ground potential differences exist between field devices and the controller. Consequently, this module proves essential for systems with distributed I/O configurations.

Technical Specifications

Parameter	Specification
Manufacturer	Siemens
Product Line	SIMATIC S5
Model	6ES5435-7LA11
Module Type	Digital Input Module
Number of Inputs	16
Input Voltage	24 V DC (20.4 to 28.8 V)
Input Current	8 mA per channel (nominal)
Input Delay	< 5 ms (typical)
Input Type	Type 1 (per EN 61131-2)
Galvanic Isolation	Yes (between each channel and backplane)
Test Voltage	500 V AC (channel to backplane)
Power Dissipation	3.5 W (max.)
Current Consumption (5V)	160 mA (typ.)
Weight	0.55 kg
Operating Temperature	0°C to 60°C
Connection Type	Screw terminal
Compatibility	S5-115U, S5-135U, S5-155U
Certifications	CE, UL, CSA

Galvanic Isolation and Noise Immunity

The 6ES5435-7LA11 provides galvanic isolation between each input channel and the backplane bus. This isolation prevents ground loops and protects the controller from voltage transients. The module withstands test voltages of 500 V AC, ensuring robust isolation performance. Consequently, this module delivers reliable signal acquisition in environments with significant electrical noise. The isolated design also allows mixing of different ground references within the same system.

Input Characteristics and Performance

Each input channel on the 6ES5435-7LA11 draws 8 mA nominal current at 24 V DC. The module provides a response time of less than 5 ms for fast signal capture. It meets Type 1 characteristics per EN 61131-2 standards. Furthermore, LED indicators on the front panel display real-time status for each input channel. Users can quickly identify active inputs for efficient troubleshooting.

Physical Characteristics and Installation

Weighing approximately 0.55 kg, this module fits standard S5 rack configurations. It occupies a single slot within the chassis. The module uses screw terminal connections for secure and straightforward field wiring. The front panel provides clear labeling for easy channel identification. Users can install the 6ES5435-7LA11 quickly without special tools.

System Compatibility

This module works with SIMATIC S5-115U, S5-135U, and S5-155U PLC systems. It communicates with the CPU through the S5 backplane bus. Users can connect this module directly to field devices such as sensors, pushbuttons, and limit switches. The isolated design ensures reliable operation even when mixing different voltage potentials.