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SIMOREG – SIMODRIVE DC Converters for Reliable DC Motor Control 

The codes 6RA2725, 6RA2732 and 6RA2775 belong to the SIMOREG DC converter family, historically integrated into SIMODRIVE and SINUMERIK architectures for controlling DC motors in high-power industrial applications.

This dual designation SIMOREG – SIMODRIVE correctly identifies:

✅ the actual electrical family (SIMOREG – DC)

✅ the integration system (SIMODRIVE / SINUMERIK)

SINAMICS – SIMOREG DC Master: guide to the DC converters of the 6RA8 series…

The drives of the SIMOREG DC-MASTER family, 6RA8 series, represent Siemens’ most reliable and established solution for controlling direct current (DC) motors. Although they historically belong to the SIMOREG line, these products are often integrated into modern architectures that include SINAMICS converters, which is why we created a dedicated article referring to them jointly as SINAMICS SIMOREG.

Consistent with many industrial implementations, they can be considered part of an expanded Siemens drive ecosystem that combines AC and DC technologies within the same automation platform.

Continuidad energética con Siemens SITOP: almacenamiento, redundancia y UPS industriales 6EP1961 6EP1931 6EP1935

En las plantas industriales modernas, la calidad del suministro eléctrico es tan crítica como la calidad de los procesos de producción.
Las micro-interrupciones, caídas de tensión o inestabilidad de la red pueden causar paradas de planta, reinicios de sistemas, pérdida de datos y daños económicos significativos.

Para abordar estas necesidades, Siemens ha desarrollado soluciones SITOP dedicadas a la continuidad energética, basadas en almacenamiento, redundancia y UPS industriales, que protegen el suministro de 24 V DC incluso en condiciones críticas.

Las raíces 6EP1961, 6EP1931 y 6EP1935 son la base de este enfoque.

Siemens SITOP Advanced: differences and applications of the 6EP1336, 6EP1337 and 6EP1434 series

With the evolution of industrial automation systems and the increasing electronic density within electrical control panels, Siemens developed the SITOP Advanced range, designed to deliver superior performance compared to the Classic line in terms of efficiency, stability, and load protection.

The 6EP1336, 6EP1337, and 6EP1434 series represent the natural transition from SITOP Classic power supplies to more modern solutions, while maintaining compatibility, reliability, and ease of integration.

Siemens SITOP Smart: Intelligent Power Supplies 6EP1436, 6EP1437, and 6EP1536

The evolution of industrial automation towards Industry 4.0 models requires power systems that are not only reliable but also intelligent, capable of monitoring the load, reporting anomalies, and actively contributing to production continuity.

The Siemens SITOP Smart range was developed with this goal in mind: to integrate diagnostic functions, advanced protection, and control within 24 V DC industrial power supplies.

The 6EP1436, 6EP1437, and 6EP1536 series represent the core of this evolution.

Siemens SITOP Modular: Architecture and Benefits of the 6EP1931, 6EP1933, and 6EP1935 Series

With the increasing complexity of industrial plants and the need to ensure operational continuity, Siemens has developed the SITOP Modular range, a modular and scalable power supply system designed to build reliable, flexible, and easily maintainable power architectures.

The 6EP1931, 6EP1933, and 6EP1935 series form the core of this approach, enabling the structured integration of power supply, redundancy, and buffering.

Siemens SITOP Classic: guide to power supplies 6EP1331, 6EP1333 and 6EP1334

Power supplies from the Siemens SITOP Classic range have for many years represented a reliable standard for 24 V DC power supply in industrial automation systems.
The 6EP1331, 6EP1333 and 6EP1334 series are among the most widely used in legacy installations, traditional electrical control panels, and control systems based on Siemens PLCs and CNCs.

In this article, we analyze the SITOP Classic cluster, clarifying features, differences, and application areas, and providing a useful guide both for those managing existing systems and for those who need to ensure long-term operational continuity.

What is a SIMODRIVE Power Supply Module and why is it essential?

Within industrial automation systems, the Power Supply Module (PSM) is the component that ensures the proper supply of energy to the entire drive chain.
Without an efficient PSM, no CNC axis, spindle, or control module can operate reliably.

The 6SN1145 root identifies the main power supply components of the Siemens SIMODRIVE 611 platform, a family still widely used in industrial environments today.

The PSM performs key functions for production continuity:

• • generation of the DC Bus voltage

  • stabilization of the power supply

  • harmonic filtering

  • protection against disturbances, spikes, and overloads

  • stable power delivery to Power Modules and Closed-Loop Units

What is a Siemens 6SN1114 Board and What Is It Used For?

The 6SN1114 root of the SIMODRIVE 611 platform includes synchronization and advanced control boards designed to manage high-level functions within SINUMERIK CNC systems.

These are specialized electronic boards that play essential roles in multi-axis systems, helping ensure:

• precise synchronization between multiple axes
• advanced management of feedback signals
• high-speed dynamic adjustments
• process stability even under variable load conditions
• coordinated operation between spindle and linear axes

They are critical components in machines that require smooth, consistent, and perfectly synchronized movements—typical of high-precision industrial applications.

What is a Siemens 6SN1113 Board and What Is It Used For?

The 6SN1113 series of the SIMODRIVE 611 family includes advanced regulation and control boards used to optimize specific axis or spindle functions.

These are specialized electronic boards that:

• manage dedicated control loops
• improve speed, torque, and synchronization regulation
• extend the functionalities of 6SN1118 Closed-Loop modules
• support advanced configurations of SINUMERIK CNC machines

The 6SN1113 boards are therefore a key component in industrial systems where high precision, dynamic stability, and immediate motor response are required.

What is a Siemens Simodrive 6SN1111 Interface Board and what is it used for?

In the Siemens SIMODRIVE 611 industrial automation system, the Interface Boards (6SN1111 series) play a crucial role:
they act as a bridge between the control modules (Closed-Loop) and the power modules, ensuring that signals, commands, and feedback are exchanged correctly, stably, and in perfect sync.

They are, in essence, the communication core of the entire drive system.

A 6SN1111 board enables:

• transmission of command signals between the CNC, Closed-Loop Unit, and Power Module

• interfacing of external encoders, resolvers, and sensors

• management of dedicated functions depending on the machine configuration

• correct synchronization between axes and spindles

• full compatibility with Siemens bus systems and proprietary protocols

Without the Interface Board, the drive system cannot communicate properly, leading to errors, instability, or the inability of machine axes to start.

What Is a SIMODRIVE Control Board and What Is It Used For?

Within Siemens SIMODRIVE 611 industrial automation systems, the Control and Regulation Boards are the electronic components that extend, specialize, and optimize the functions of the Closed-Loop modules.

They are the system’s “additional intelligence”: they handle advanced logic, synchronization, communication, and dedicated functions that are not managed by the power modules or the Closed-Loop modules.

In practice, the Control Boards are what allow a CNC system to become: more precise, more versatile, faster, and more integrated with the machine.