Name: Siemens 6ES7131-4EB00-0AB0 Digital Input Electronic Module
Brand: Siemens
SKU: 22721
Availability: InStock
Rating: 5.0 (1 reviews)

Introduction

The Siemens 6ES7131-4EB00-0AB0 Digital Input Electronic Module is part of the SIMATIC ET 200S distributed I/O product family. It is designed to acquire 120 V AC binary signals from compatible industrial switches and make their states available to a higher-level PLC.

The module provides two digital input channels in a compact 15 mm-wide format. Its IEC 61131 Type 1 input characteristics support suitable switching devices, while individual green status LEDs help technicians monitor input states during commissioning and maintenance.

The module operates with a nominal input voltage of 120 V AC and supports a frequency range of 47–63 Hz. Its input response is designed for standard AC signal acquisition, with specified delays of at least 15 ms for a low-to-high transition and 25 ms for a high-to-low transition. Dedicated diagnostic functions and support for standard two-wire proximity sensors are not provided.

The 6ES7131-4EB00-0AB0 is listed as a spare-part product and is in the process of discontinuation. When purchasing it for an existing installation, verify stock availability, the exact catalog number, and compatibility with the installed ET 200S terminal module.

Technical Specifications

Parameter	Specification
Brand	Siemens
Model	6ES7131-4EB00-0AB0
Product Type	Digital Input Electronic Module
Product Family	SIMATIC ET 200S
Module Designation	2DI 120 V AC ST
Number of Digital Inputs	2
Rated Input Voltage	120 V AC
Permissible AC Supply Range	102–144 V AC
Input Frequency	47–63 Hz
Logic 0 Input Voltage	0–20 V AC
Logic 1 Input Voltage	79–132 V AC
Typical Input Current at Logic 1	3 mA
Input Current Range at Logic 1	3–9 mA
Input Characteristic	IEC 61131 Type 1
Input Delay, 0 to 1	Minimum 15 ms
Input Delay, 1 to 0	Minimum 25 ms
Two-Wire Sensor Support	No
Diagnostic Function	No
Input Status Indicators	Green LED per channel
Channel-to-Channel Isolation	No
Isolation from Backplane Bus	Yes
Permissible Potential Difference	1,500 V AC between internal reference potential and inputs
Insulation Test Voltage	2,500 V DC
Typical Power Dissipation	0.5 W
Maximum Shielded Cable Length	1,000 m
Maximum Unshielded Cable Length	600 m
Module Width	15 mm
Dimensions (W × H × D)	15 × 81 × 52 mm
Dimensions (inches)	0.59 × 3.19 × 2.05 in
Weight (provided specification)	0.172 kg
Weight (provided specification, lb)	0.38 lb
Installation	Compatible SIMATIC ET 200S terminal module required
Product Lifecycle	In the process of discontinuation; listed as a spare part

Note: Dimensions and weight follow the supplied product information. Siemens technical documentation lists the electronic module itself at approximately 31 g, while the supplied weight of 0.172 kg corresponds to the manufacturer's catalog net weight. Confirm the relevant shipping or component weight when necessary.

Recommended Related Models

The following Siemens modules may be relevant when maintaining or expanding SIMATIC ET 200S installations. Their input voltage and channel configurations differ, so verify the electrical requirements before selecting a replacement.

Model	Product Type	Typical Function
6ES7131-4EB00-0AB0	Digital Input Module	2-channel, 120 V AC input
6ES7131-4CD02-0AB0	Digital Input Module	4-channel, 24–48 V AC/DC input
6ES7131-4BD01-0AA0	Digital Input Module	4-channel, 24 V DC standard input
6ES7131-4BB01-0AA0	Digital Input Module	2-channel, 24 V DC input
6ES7132-4BB01-0AB0	Digital Output Module	Digital output control
6ES7193-4CA50-0AA0	Terminal Module	ET 200S connection and wiring

Popular Related Models

These additional Siemens automation products may be relevant to distributed I/O systems, industrial signal acquisition, and PLC-based control applications.

Model	Product Category	Application
6ES7131-4EB00-0AB0	Digital Input Module	Two-channel 120 V AC signal acquisition
6ES7132-4BB01-0AB0	Digital Output Module	Digital actuator control
6ES7134-4JB01-0AB0	Analog Input Module	Analog sensor signal acquisition
6ES7135-4GB01-0AB0	Analog Output Module	Analog control signal output
6ES7138-4CA01-0AA0	Power Module	ET 200S station power management
6ES7193-4CB20-0AA0	Terminal Module	Distributed I/O connection and wiring

Ordering recommendation: Before purchasing the Siemens 6ES7131-4EB00-0AB0, confirm the 120 V AC input requirement, terminal module compatibility, and product condition. As this model is in the process of discontinuation, verify availability for maintenance and replacement projects.

Applications

The Siemens 6ES7131-4EB00-0AB0 is a SIMATIC ET 200S digital input electronic module designed to acquire 120 V AC signals from industrial field devices. Designated as a 2DI 120 V AC ST module, it provides two digital input channels for monitoring compatible switches and transmitting their states to a PLC through the ET 200S distributed I/O system.

Typical applications include:

Industrial machine control: Monitoring switches and equipment status signals operating at 120 V AC.
Production line automation: Collecting discrete signals from compatible AC-powered control devices.
Equipment status monitoring: Detecting operating states in industrial machinery and electrical control systems.
PLC-based automation: Transferring binary input signals to a compatible controller through the ET 200S backplane bus.
Distributed I/O installations: Integrating AC digital inputs into modular control cabinets.
Legacy system maintenance: Replacing a matching module in an existing SIMATIC ET 200S installation.

This module is specifically designed for 120 V AC digital inputs. It should not be treated as a standard 24 V DC input module, and field wiring must follow the specified AC input requirements.

Advantages

Two digital input channels: Monitors two independent AC switching signals.
120 V AC input: Supports compatible industrial control signals at the specified AC voltage.
Compact 15 mm width: Helps conserve installation space in ET 200S assemblies.
Individual status indicators: Green LEDs indicate the state of each digital input channel.
IEC 61131 Type 1 input characteristics: Supports compatible industrial switching devices.
Electrical isolation: Provides galvanic isolation between the input circuits and the backplane bus.
Defined input response: Offers specified input delays for rising and falling signal transitions.
Modular integration: Installs within a compatible SIMATIC ET 200S distributed I/O station.
Suitable for maintenance applications: Provides a replacement option for systems configured for this exact 120 V AC input module.

Technical FAQs

Q1: What is the Siemens 6ES7131-4EB00-0AB0?

It is a SIMATIC ET 200S digital input electronic module with two 120 V AC digital input channels.

Q2: How many digital inputs does this module provide?

The module provides two digital inputs for monitoring compatible AC switching signals.

Q3: What is the rated input voltage?

The rated input voltage is 120 V AC, with a specified operating frequency range of 47–63 Hz.

Q4: What voltage is recognized as a logic 1?

The specified input voltage range for logic 1 is 79–132 V AC.

Q5: What voltage is recognized as a logic 0?

The specified input voltage range for logic 0 is 0–20 V AC.

Q6: What is the input delay?

The minimum specified input delay is 15 ms for a transition from logic 0 to logic 1 and 25 ms for a transition from logic 1 to logic 0.

Q7: Does the module support two-wire proximity sensors?

No. The module is intended for compatible 120 V AC switching devices and does not support standard two-wire proximity sensors as specified for this product.

Q8: Does the module provide diagnostic functions?

No. The module does not provide dedicated diagnostic functions. Green LEDs indicate the individual digital input states.

Q9: Are the two input channels electrically isolated from one another?

No. The two channels are not electrically isolated from each other. The input circuits are isolated from the backplane bus.

Q10: What should be checked before replacing this module?

Verify the complete part number, 120 V AC input requirements, 47–63 Hz frequency range, terminal module compatibility, and field wiring. Do not replace it with a 24 V DC module unless the electrical design and system configuration are changed accordingly.

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