Siemens 6ES7138-4DF01-0AB0

Siemens 6ES7138-4DF01-0AB0 Serial Interface Module

The Siemens 6ES7138-4DF01-0AB0 is a specialized serial interface module from the SIMATIC DP ET 200S series, designed to support streamlined communication between serial field devices and distributed control systems. This module is equipped with a single-channel Serial Interface (SI) compatible with RS232 and RS422 communication standards. Its compact form and robust design make it ideal for integrating legacy serial devices—such as barcode scanners, printers, sensors, or legacy controllers—into modern automation systems. As part of Siemens' ET 200S line, the 6ES7138-4DF01-0AB0 is built for durability, flexibility, and reliability in complex industrial environments.

Versatile Serial Connectivity in Distributed I/O Systems

This module enables the SIMATIC ET 200S system to connect to serial-based equipment using RS232 or RS422 standards. RS232 is commonly used for point-to-point connections over shorter distances, while RS422 is suitable for faster, longer-range communication in multi-drop applications. With one communication channel, the 6ES7138-4DF01-0AB0 is perfect for installations requiring a single, reliable serial connection. It is an ideal solution for automation environments that must incorporate older or non-Ethernet-capable hardware into modern distributed architectures.

Integrated into the SIMATIC ET 200S Modular Platform

The 6ES7138-4DF01-0AB0 fits directly into the flexible ET 200S system—Siemens' modular, space-efficient I/O solution for distributed automation. This hot-swappable module can be mounted directly onto the ET 200S backplane, allowing quick upgrades or replacements without interrupting operations. Through seamless integration with PROFIBUS and configuration via Siemens engineering tools like STEP 7 or TIA Portal, it supports centralized diagnostics, configuration, and monitoring while maintaining high system uptime and minimal maintenance overhead.

Reliable Communication and Industrial Performance

The serial interface module provides dependable communication in environments with electrical interference or mechanical stress. Its RS232/422 capabilities ensure robust and consistent data transfer between automation systems and connected serial devices. In production settings where serial equipment still plays a critical role, this module delivers essential connectivity while maintaining high reliability, signal integrity, and system performance.

Exceptional Service from MRO Electric and Supply

Purchasing the Siemens 6ES7138-4DF01-0AB0 through MRO Electric and Supply includes added benefits such as a full 2-year warranty and free shipping. These advantages offer peace of mind, reduced downtime risks, and excellent value. MRO Electric's reputation for fast, dependable service ensures that professionals in the industrial automation sector can get the components they need when needed.

Frequently Asked Questions (FAQ)

What is the Siemens 6ES7138-4DF01-0AB0 used for?

It connects serial RS232 or RS422 devices to an ET 200S distributed I/O system.

Which serial protocols are supported?

It supports both RS232 and RS422 serial communication standards.

How many serial connections does this module support?

The module supports a single serial communication channel.

Is this module compatible with SIMATIC ET 200S?

It is specifically designed for seamless integration into the ET 200S modular I/O system.

Can this module be used in noisy industrial environments?

It is built to Siemens' industrial standards for reliability in challenging electrical and physical conditions.

What kind of devices can be connected to this module?

Devices like barcode scanners, serial sensors, legacy PLCs, and industrial printers can be connected.

What Siemens software is used to configure the module?

Configuration is done using STEP 7 or TIA Portal, both Siemens engineering platforms.

Does the module need an external power source?

No, it receives power through the ET 200S backplane, eliminating the need for separate wiring.

What warranty is offered by MRO Electric?

MRO Electric offers a 2-year warranty with every purchase of this module.

Is free shipping available?

MRO Electric includes free shipping, adding convenience and savings to your purchase.

Siemens products are manufactured in Germany and are designed for Automotive, aerospace, power generation, and electronics usage. They come with a 2-year warranty from MRO Electric. We also carry Interface Modules from other manufacturers such as FANUC and Yaskawa.

Contact Us Today For More Information About Siemens Products

Check out the rest of our Siemens product line. Whether it's using our online instant quote feature, giving us a call at (800) 691-8511, or emailing us at sales@mroelectric.com, we strive for customer satisfaction first. This means lower prices and better service for you. For more products like 6ES7138-4DF01-0AB0, take a look at more from our Interface Modules line. If your current unit has gone bad, take advantage of our Core Exchange program for the most inexpensive route. You can learn more about this program on our FAQ page here. We offer a repair service on all of our 6ES7138-4DF01-0AB0 products that keep your downtime to a minimum. To stay up to date on manufacturer news, as well as access any of our datasheets, manuals, or other documentation, we suggest you take a look at our blog.