SIEMENS 6AV2125-2JB23-0AX0

What is the 6AV2125-2JB23-0AX0 and where is it used?

The 6AV2125-2JB23-0AX0 is the SIEMENS SIMATIC HMI KTP900F Mobile, a 9-inch mobile operator panel for machines and industrial systems with PROFINET / Industrial Ethernet connectivity. The device combines touchscreen and keypad operation and is designed for applications where operators are not permanently stationed at a control cabinet but need to move between different points of a machine or production line. Typical applications include interconnected production systems, manual workstations, robotic cells and safety-related applications, as the panel integrates a key switch, enable switch and emergency stop button. The device can be engineered from WinCC Comfort V13 SP1 onwards. Siemens classifies the KTP900F Mobile within the Mobile Panels 2nd Generation family.

Overview of the key technical specifications and their significance

The KTP900F Mobile features a 9-inch TFT widescreen display with a resolution of 800 × 480 pixels and 16.7 million colours. For maintenance personnel, this provides clear visualisation of process screens, alarm messages and diagnostic information directly at the machine.

The 10 LED-equipped function keys complement the touchscreen wherever defined, glove-friendly or safety-guided operation is required. The device is powered by 24 V DC, with a permissible voltage range of 19.2 to 28.8 V DC. It includes 1 × PROFINET interface, 1 × USB 2.0 port and 1 × SD memory card slot.

For demanding industrial environments, Siemens specifies IP65 protection on all sides, an operating temperature range of 0 to 45 °C, and safety ratings of Performance Level e (PLe) according to ISO 13849-1 and SIL 3 according to IEC 61508 when used in safety applications.

Product status, life-cycle status and obsolescence

For procurement and spare-parts planning, an important point is that Siemens currently classifies 6AV2125-2JB23-0AX0 as an Active Product (PM300). The product family was released by Siemens in 2015 and remains part of the active Mobile Panels 2nd Generation portfolio.

This means the device is not a discontinued product. At the same time, Siemens does not currently identify an official direct successor for this specific order number. Although Siemens describes the TP1000F Mobile as being based on the KTP900F Mobile platform, it is not designated as a formal 1:1 successor to this MLFB.

For operators of machines with long service lives, proactive spare-parts and service planning therefore remains advisable.

Available EICHLER services and when they are relevant in practice

For 6AV2125-2JB23-0AX0, EICHLER offers several service options that may be appropriate depending on the fault scenario, budget and downtime requirements.

In the event of a defect, component-level repair can be an attractive option when the existing unit is to be retained and replacement costs reduced. EICHLER describes a standardised process consisting of diagnosis, quotation, repair and functional testing.

Where machine downtime must be minimised, an exchange unit can be advantageous because a fully tested replacement device can be supplied in advance. For spare-parts inventory and long-term availability planning, tested used units are often a cost-effective solution.

In addition, Life Cycle Management services help companies systematically manage inventory, supply risks and long-term support strategies for critical components. According to the product page, repair, exchange, used units and new units on request are currently available, with 1–3 day lead times listed for repair, exchange and used units.

Is 6AV2125-2JB23-0AX0 still active or already discontinued?

Siemens currently lists 6AV2125-2JB23-0AX0 as an active product. For purchasing and spare parts planning, this is an important point because official manufacturer references, documentation and accessories remain available. At the same time, supply security remains relevant, as mobile HMI devices in existing systems are often used far longer than typical electronics life cycles.

Which connection box is compatible with 6AV2125-2JB23-0AX0?

The KTP900F Mobile belongs to the Mobile Panels 2nd Generation family. Siemens specifies several compatible connection boxes. In the standard KTP Mobile environment, these are the Connection Box compact (6AV2125-2AE03-0AX0), standard (6AV2125-2AE13-0AX0) and advanced (6AV2125-2AE23-0AX0). Siemens also describes compatibility with PN Basic (6AV6671-5AE01-0AX0) and PN Plus (6AV6671-5AE11-0AX0), although with functional limitations in F-system applications. For safety-related applications, the connection box should therefore always be checked against the specific system architecture.

Which software is required to configure the KTP900F Mobile?

According to Siemens, this device requires WinCC Comfort V13 SP1 Update 4 or later or WinCC Advanced V13 SP1 Update 4 or later for configuration. If the fail-safe panel is to be operated within a PROFIsafe-based F-system, STEP 7 Safety Advanced V13 SP1 or later is also required. This is particularly important for maintenance personnel, as many communication or transfer issues are caused by incompatible engineering versions or missing safety packages.

Which cable lengths are available for the KTP900F Mobile?

Siemens specifies several standard cable lengths for the KTP Mobile connection cable: 2 m, 5 m, 8 m, 10 m, 15 m, 20 m and 25 m. This is relevant for system planning because cable length, operating range and the position of the connection box directly influence how flexibly the mobile panel can be used within the production environment. For fixed storage locations or wall-mounted holders, the cable length should therefore always be considered together with the installation position.

Is the KTP900F Mobile suitable for safety applications?

Yes. The device is explicitly designed as a fail-safe mobile panel and features an enabling switch, emergency stop/stop pushbutton and key switch. Siemens specifies PL e according to ISO 13849-1 and SIL 3 according to IEC 61508 for safety operation. In safety applications, however, not only the panel itself is important, but also the correct connection box, proper PROFIsafe parameterisation and seamless integration into the controller's F-program.

When is repair more suitable than replacement or purchasing a used unit?

Repair is particularly worthwhile when the existing device is fundamentally suitable for the machine, the fault is clearly located within the panel and the existing hardware should be retained. Replacement is the better option when downtime must be ended immediately and a fully tested replacement unit can restore operation faster than a repair. Purchasing a used unit is especially suitable for spare parts stock, reserve devices or supporting older systems. EICHLER describes standardised diagnostic and testing processes for repairs and also offers replacement and used units with warranty or guarantee coverage.