Siemens 6ES5400-7AA13 Digital Input Module

This module captures field signals from sensors, switches, and push buttons. The Siemens 6ES5400-7AA13 provides 16 digital inputs for 24 V DC devices. It measures 232 mm in width and 75 mm in height. This unit weighs approximately 0.52 kg for standard rack mounting.

Technical Specifications Table

Parameter	Value
Product Model	Siemens 6ES5400-7AA13
Category	Digital Input Module
Number of Inputs	16 channels
Input Type	Sink (NPN), 24 V DC
Input Voltage Range	20.4 V DC to 28.8 V DC
Input Current	7 mA typical per channel
Input Delay	3 ms (configurable)
Dimensions (W x H x D)	232 mm x 75 mm x 130 mm
Weight	0.52 kg
Connector Type	1 x 20-pin female screw terminal
Internal Components	16 x optocouplers, 1 x filter circuit
Electrical Isolation	500 V AC between inputs and backplane
Energy Storage	None (volatile inputs reflect real-time status)
Input Filtering	Programmable from 0.5 ms to 15 ms
Operating Temperature	0°C to 60°C

Internal Design and Signal Processing

This input module uses sixteen optocouplers for electrical isolation. Each optocoupler protects the backplane from field device surges. The Siemens 6ES5400-7AA13 includes a programmable filter circuit for noise rejection. You can set the input delay from 0.5 ms to 15 ms as needed. The module stores no input states after power loss. Consequently, the CPU reads fresh input values during each scan cycle. Green LEDs on the front panel show the real-time status of all 16 channels.

Installation and Wiring Guide

First, mount this module into any S5 rack slot except the CPU slot. Next, connect your 24 V DC supply common to the negative rail. Then, wire your sensor outputs to the 16 input pins (channels 0 to 15). Each input accepts signals from proximity switches, limit switches, or push buttons. Use shielded cables for long sensor runs exceeding 50 meters. The module automatically maps inputs to the CPU’s process image table. This unit works with all SIMATIC S5 CPU models including 115U, 135U, and 155U. Always verify the input voltage polarity before connecting field devices.