SIEMENS 6AV2123-2DB03-0AX0

What is 6AV2123-2DB03-0AX0 and where is it used?

The 6AV2123-2DB03-0AX0 refers to the Siemens SIMATIC HMI KTP400 Basic, a compact 4.3-inch operator panel designed for simple to medium-level visualisation and machine operation tasks directly at the machine. The device combines touch operation with four function keys and is intended for typical HMI functions such as displaying messages, acknowledging faults, entering setpoints, operating simple recipes and visualising machine states.

Thanks to its PROFINET interface, the panel is particularly suitable for compact machine concepts, retrofit projects, and replacing existing operator panels. Siemens specifies compatibility with systems such as S7-1200, S7-1500, S7-300/400, LOGO!, SIMOTION, and other Ethernet-based controllers.

Overview of key technical data and what it means

The panel features a 4.3-inch TFT widescreen display (480 × 272 pixels, 65,536 colours). In practical terms, this provides a clear and compact representation of process values, messages and operator screens within a small footprint.

It uses a resistive analog touchscreen, which is robust and can often be operated with gloves or in harsh industrial environments. In addition, it includes four function keys, a 24 V DC power supply, a typical power consumption of only 3 W, one Industrial Ethernet/PROFINET interface, and one USB interface.

With IP65 front protection and IP20 rear protection, the device is designed for panel or cabinet front mounting in industrial indoor environments. For maintenance and device replacement, it supports manual backup/restore and device switchover functions.

Product status, life cycle status and obsolescence

Siemens currently classifies the 6AV2123-2DB03-0AX0 as a PM300 / Active Product within the Standard devices 2nd generation portfolio. PM300 indicates that the product is in its active phase and is fully available for ordering.

No official end-of-life or obsolescence status is currently specified for this order number.

For modernisation projects, Siemens also notes that the transition from KTP400 Basic to MTP400 Unified Basic is mechanically compatible in terms of panel cut-out, meaning no change to the mounting opening is required. However, this is considered a modernisation option rather than a direct 1:1 successor, and therefore requires project-specific evaluation.

Available EICHLER services and when they are relevant in practice

For the 6AV2123-2DB03-0AX0, EICHLER offers repair, replacement, used units and new devices. This is particularly relevant when production downtime is critical and not only availability but also the fastest possible return to operation is required.

Repair is suitable when the existing project, mechanical installation and machine logic are to be preserved. EICHLER combines this with technical cleaning, preventive maintenance, full functional testing, and at least a 24-month warranty.

Replacement services are especially valuable under high time pressure. Used units can be economically attractive, while new units support standardised spare parts strategies and planned stockkeeping.

Is 6AV2123-2DB03-0AX0 still an active Siemens product?

Yes. Siemens currently lists 6AV2123-2DB03-0AX0 as an Active Product with lifecycle status PM300. This means the panel is still in its active sales phase and is not in any end-of-life or spare parts-only stage.

For procurement and maintenance, this is important because the article number is still regularly available on the market. However, for long-term plant strategies, it is still worth considering migration paths, as Siemens documents a mechanically compatible transition to the MTP400 Unified Basic for the 4-inch class. “Active” therefore does not automatically mean that future migration planning can be ignored.

Can I still engineer 6AV2123-2DB03-0AX0 with WinCC flexible?

For this specific article number, you should plan with WinCC Basic / STEP 7 Basic (TIA Portal V13 or higher). Siemens defines this panel within the TIA Portal engineering environment.

This is important for engineering and service because older HMI generations in the field are often still associated with different engineering tools. Anyone migrating or maintaining an existing project should therefore first check the exact order number and installed engineering version, as the article number determines the correct software path.

Which software is required for engineering and OS updates?

For engineering, Siemens specifies WinCC Basic / STEP 7 Basic from TIA Portal V13 onwards. For service tasks such as operating system updates or factory reset, Siemens uses the TIA Portal service environment and the corresponding image handling tools.

In practice, this means:First ensure the correct device version is selected in the TIA project, then verify panel images and software versions, and only then perform download or OS update. Engineering version, device image and project state must match, otherwise typical download and compatibility errors occur.

Which controllers and protocols can the KTP400 Basic communicate with?

The panel is designed for more than a single PLC family. Siemens lists supported systems including S7-1200, S7-1500, S7-300/400, LOGO!, SIMOTION, and other Siemens controllers.

On the protocol side, relevant communication options include PROFINET, TCP/IP, EtherNet/IP and Modbus TCP/IP. For maintenance engineers, this makes the KTP400 Basic suitable for mixed machine environments. For procurement, it reduces the risk of stocking an HMI that is tied to only a very narrow application range.

Can a KTP400 Basic be mechanically replaced by an MTP400 Unified Basic?

Mechanically, yes: Siemens documents the transition from KTP400 Basic to MTP400 Unified Basic as installation-compatible, meaning no change to the mounting cut-out is required.

However, from a project perspective, this is not a simple one-to-one replacement. Siemens provides dedicated migration tools for the Unified platform and also highlights changes such as the higher resolution of the MTP series. For decision-makers, this is crucial: mechanical compatibility does not automatically solve software migration requirements. For unplanned downtime scenarios, a like-for-like replacement is usually the faster option.

Is the panel suitable for harsh industrial environments?

For typical indoor machine environments, yes. Siemens specifies IP65 front protection and IP20 rear protection, a 24 V DC supply, a typical power consumption of around 3 W, and operating conditions up to 50 °C in landscape mounting.

This makes the panel suitable for machine fronts or control cabinet doors. However, Siemens still classifies it as an indoor industrial device. Dust, moisture and operator interaction are considered on the front side, but the rear installation area must still be adequately protected.

Is repair, replacement or new purchase the best option in case of failure?

This depends heavily on downtime pressure, project constraints and spare parts strategy. If the existing HMI project must remain unchanged and the machine installation should not be modified, repair is often the most economical option.

If downtime is critical, a replacement unit is usually the fastest way back into production. For planned spare parts strategies or standardisation, new units may be the most consistent solution.

For this article number, EICHLER offers repair, replacement, used units and new devices. The repair service typically includes cleaning, preventive maintenance, full functional testing, and a minimum 24-month warranty.