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SINUMERIK 6FC Roots: how to read the codes and identify the type (NCU, HMI, options, spare parts)

When discussing Siemens CNC systems, the SINUMERIK family represents an industrial standard for machine tools, automated lines, and complex plants.

Many product codes start with the root 6FC….

But what does this designation really mean?
How can you determine whether it is an NCU, an HMI panel, an option board, or simply an electronic spare part?

In this technical guide we analyze:

• How to read a 6FC root
• How to identify the product type
• How to avoid compatibility errors
• How to manage obsolescence strategically

Auxiliary and Communication Modules for the Reliability of SIMODRIVE and SINUMERIK Systems 

The roots 6FX5002, 6FX8002 and 6EW1890 belong to the family of auxiliary, interface and power support modules used in SIMODRIVE and SINUMERIK systems to ensure electrical stability and communication continuity between the various machine subsystems.

They are not direct power components, but they play an essential role in the overall reliability of the system.

⚙️ Interface and connection modules for SIMODRIVE and SINUMERIK systems ⚙️

The 6FC9344, 6FC9348 and 6FX2001 roots belong to the family of interface, connection and communication modules used in SIMODRIVE and SINUMERIK systems to ensure stable and reliable data exchange between CNC, drives, peripherals and industrial networks.

These components do not directly manage power, but they are crucial for ensuring continuous and reliable machine communication.

⚙️ SINUMERIK / SIMODRIVE Interface Modules for CNC and Drive Integration ⚙️

The 6FC9320 root belongs to the SINUMERIK and SIMODRIVE ecosystem and is used as an interface and integration module between the numerical control (CNC) and drives in industrial automation systems.

It is therefore a cross-functional component, not a power unit, but essential for communication, synchronization, and the operational stability of the entire machine system.

Siemens MICROMASTER Mid-Power and Cabinet – modular drives for large industrial plants

The MICROMASTER Mid-Power and Cabinet versions represent the high-power range of the MICROMASTER family, designed for centralized installations and large industrial facilities.

Unlike compact inverters installed on individual machines, these systems drive entire production sections or plant utilities.

They are typically installed in power cabinets and modular systems.

Siemens MICROMASTER 4 – Accessories and communication modules (BOP, AOP, PROFIBUS, I/O)

The MICROMASTER 4 series drives (MM420, MM430, MM440) do not operate in isolation: machine management depends on operator panels, communication modules, and control interfaces.

In maintenance practice, a large percentage of machine downtime is not caused by the power drive but by these electronic peripherals.

Siemens MICROMASTER 440 (MM440) – vector inverter for dynamic and heavy-duty applications

The MICROMASTER 440 is the high-performance version of the MICROMASTER 4 series, designed for dynamic industrial applications where torque and speed control are essential.

Installed on thousands of automatic machines between 2003 and 2016, it is still present today in production lines where motion precision and process stability are critical.

Unlike standard models, a failure does not just slow production: it directly affects product quality.

Siemens MICROMASTER 430 (MM430) – inverter for industrial pumps and fans

The MICROMASTER 430 is the Siemens inverter specifically designed for fluid-dynamic applications such as pumps and fans.
Widely installed in technological plants and industrial utilities between 2003 and 2016, it is still present today in many facilities where it regulates pressure, flow rate and ventilation.

Unlike other drives, its shutdown does not stop just one machine: it often halts the entire plant service.

Siemens MICROMASTER 420 (MM420) – standard inverter for general applications

The MICROMASTER 420 is one of the most widely used Siemens inverters for standard industrial automation applications.
Installed on thousands of compact machines between 2003 and 2016, it is still present today in many production lines where it performs essential motion functions.

These are typically systems that are still mechanically efficient, but designed around this specific drive.

Siemens MICROMASTER – Optional accessories and modules (power supplies, interfaces and platform spare parts)

In MICROMASTER systems, machine downtime is not caused only by the power inverter: very often the plant stoppage originates from the electronic support modules.

In many cases the drive is powered and apparently working, but the machine does not start because a peripheral device does not allow start-up or communication with the control system.

Siemens MICROMASTER Eco 6SE32xx – pumps, fans and service continuity

The MICROMASTER Eco series is the variant of the Classic platform optimized for fluid-dynamic applications with continuous operation, where stability and reliability prevail over dynamics.

It is widely installed in technical plants, utilities and continuous industrial processes.

MICROMASTER Inverter Vector Control (6SE31xx) – Dynamic control and production continuity

The MICROMASTER Vector series represents the evolution of the Classic platform, designed for applications where simple V/f control does not ensure sufficient stability and precision.

It is widely used in automatic lines and machines with variable loads, where drive stoppage causes immediate production downtime.