SIEMENS 6AV2124-1DC01-0AX0

What is 6AV2124-1DC01-0AX0 and where is it used?

6AV2124-1DC01-0AX0 is the SIEMENS SIMATIC HMI KP400 Comfort, a compact 4.3-inch operator panel with keypad operation designed for machine-level visualisation and control. The device is intended for operating and monitoring tasks where a robust HMI with PROFINET as well as MPI/PROFIBUS DP connectivity is required. Typical applications include packaging machinery, conveyor systems, machine tools, retrofit projects and existing installations where a compact front-mounted panel with a clearly defined key-based operating concept is preferred over a touchscreen. For maintenance personnel, the part number is particularly important when a faulty panel must be quickly identified, replaced or sent for repair. For purchasing departments, the device belongs to a well-established Siemens product family that has been used in machine designs for many years.

Overview of the key technical data and what they mean

The KP400 Comfort operates on 24 V DC with a permissible range of 19.2 to 28.8 V DC and typically requires only 3.1 W of power. The TFT display provides a resolution of 480 × 272 pixels and supports 16.7 million colours. Operation is performed via 8 LED-equipped function keys, system keys and numeric and alphanumeric keypad input; a touchscreen is intentionally not included. For integration into existing installations, the communication interfaces are particularly important: 1 × Industrial Ethernet/PROFINET, 1 × RS422/485 for MPI/PROFIBUS DP, 1 × USB Mini-B and 2 SD card slots. The panel is rated IP65 on the front and IP20 on the rear. For panel replacement and mechanical compatibility checks, the 136 × 172 mm cut-out, 152 × 188 mm front dimensions and 48 mm installation depth are also relevant.

Product status, lifecycle status and obsolescence

For 6AV2124-1DC01-0AX0, Siemens has announced the product phase-out with a scheduled date of 31 January 2026. Siemens identifies SIMATIC Unified Comfort as the successor platform and assigns 6AV2128-3GB06-0AX1 as the replacement product for the KP400 Comfort. Siemens currently lists this successor as an active product. For plant operators, it is important to understand that this is not simply a part-number replacement. The successor is a Unified Comfort Panel featuring a 7-inch touchscreen and requires engineering with WinCC Unified Comfort V16 or higher. As a result, the KP400 Comfort often remains a strong candidate for repair, exchange units or strategic spare-parts stocking whenever a fast 1:1 functional replacement is required in the field.

Available EICHLER services and when they are relevant in practice

For 6AV2124-1DC01-0AX0, EICHLER offers repair, exchange, used units and new units on request. These options are particularly relevant for maintenance and purchasing teams when machine downtime must be minimised but a migration to a new HMI generation has not yet been planned. Repair is often the preferred solution when the existing device, project configuration and installation environment should remain unchanged. EICHLER combines this service with technical cleaning, preventive maintenance, comprehensive functional testing and a minimum 24-month warranty. Exchange units are particularly useful when production must resume as quickly as possible and extended downtime is not acceptable. Used devices can help reduce obsolescence-related risks economically, while new units on request support structured procurement processes. These service options help maintain system availability even when the original manufacturer platform is already entering its phase-out stage.

Is 6AV2124-1DC01-0AX0 a touch panel?

No. 6AV2124-1DC01-0AX0 is the KP400 Comfort and therefore a pure key-operated panel without touch functionality. If a combination of key and touch operation is required within the same 4-inch class, the corresponding device in this product family is the KTP400 Comfort, article number 6AV2124-2DC01-0AX0. This distinction is important for purchasing and spare parts management, as KP and KTP panels differ in project design, operating concept and replacement planning.

Which software is required to configure the KP400 Comfort?

The device is configured using WinCC Comfort, WinCC Advanced or WinCC Professional, each starting from Version V11. Siemens explicitly states in the technical documentation that STEP 7 Basic, STEP 7 Professional alone, and the older WinCC flexible versions are not intended as engineering software for this panel. For existing installations, this information is particularly important because the availability of the correct engineering environment often determines whether repair, migration or replacement can be carried out efficiently.

Which power supply and interfaces are important for commissioning?

The panel requires a 24 V DC power supply. The permissible voltage range is 19.2 to 28.8 V DC. For communication, the device provides PROFINET/Industrial Ethernet as well as MPI/PROFIBUS DP. In addition, it features one USB interface and two SD card slots. For maintenance personnel, these specifications are important because they indicate whether an existing machine concept can continue to operate without additional hardware or whether communication and storage concepts must be adapted during a retrofit.

Which dimensions are critical for panel installation and replacement?

For mechanical evaluation, the most important dimensions are the 136 × 172 mm cut-out, the 152 × 188 mm front dimensions and the 48 mm installation depth. Siemens also states that the cut-out of the KP400 Comfort is compatible with the OP 77B. This is particularly helpful during retrofit projects and replacements because the control cabinet often does not require mechanical modification. Nevertheless, the front dimensions and installation depth should always be checked separately before replacement, as identical cut-outs do not automatically mean identical device housings.

Is there a Siemens successor for 6AV2124-1DC01-0AX0?

Yes. As part of the product phase-out announcement, Siemens identifies SIMATIC Unified Comfort as the recommended successor platform and assigns 6AV2128-3GB06-0AX1 as the successor to the KP400 Comfort. This successor remains an active product. However, this does not automatically mean a direct 1:1 replacement. The specified successor is an MTP700 Unified Comfort with a 7-inch touch display and is engineered using WinCC Unified Comfort from Version V16 onwards. Any migration should therefore be carefully prepared from both a technical and project perspective.

Is the KP400 Comfort still economically viable despite its phase-out status?

Yes, in many existing installations it remains a practical solution. For running production systems, an immediate platform migration is often less economical than securing the existing HMI infrastructure. Common strategies include repair, replacement units, used devices and targeted spare parts stocking. These options remain available for this model. When machine downtime costs exceed the benefits of an immediate migration, continuing to operate the existing KP400 concept is often the lower-risk approach.

When is repair more appropriate than replacement for this panel?

Repair is particularly beneficial when the existing device fits mechanically into the machine, the project should remain unchanged and the fault is likely located within the panel itself. Replacement is usually the better option when production pressure is high and the fastest possible return to operation is the priority. Repair services for this model typically include technical cleaning, preventive maintenance, comprehensive functional testing and a minimum 24-month warranty. This makes repair especially attractive when the machine is expected to remain in operation for many years, even though the platform has already entered the product life-cycle phase-out stage.