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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.

What is a Siemens Simodrive Power Module and what is it used for?

In every industrial automation system, the power module is the component that supplies the motor with the energy it needs to move.
It is the element that converts the voltage coming from the Power Supply into controlled current, regulating:

torque, speed, direction, and acceleration, without any loss of precision or stability.

In practice, the Power Module is the “electric muscle” of the drive system:
it receives impulses from the control module (Closed-Loop Unit) and converts them into physical power delivered to the motor.

Siemens SIMODRIVE 611 – 6SN1117 Control Modules: The Heart of CNC Precision

The Siemens SIMODRIVE 611 6SN1117 modules are among the most reliable and long-lasting components in CNC automation systems. Designed to manage axes and spindles with extremely high precision, they are still used in thousands of machine tools thanks to their robustness, operational continuity, and full compatibility with the SINUMERIK ecosystem.

Despite their commercial discontinuation, the 6SN1117 modules remain essential in modern manufacturing—especially in environments where stability, accuracy, and process consistency are non-negotiable requirements.

Technical description – Siemens 6SN1118-0BK / 6SN1118-0BJ

The Siemens 6SN1118-0B series belongs to the SIMODRIVE 611 range, designed for the control of high-performance multi-axis systems.
These are closed-loop control units that use resolver feedback to continuously monitor motor position and speed, ensuring exceptional motion accuracy and dynamic stability.

These modules are compatible with SINUMERIK 810D / SINUMERIK 840D CNC systems and are among the most widely used configurations in Siemens industrial mechatronics, thanks to their reliability and their easy integration into SIMODRIVE 611 modular racks.