Update: Discontinuation of SINUMERIK 840D sl HMI Hardware as of 1 October 2025

Siemens published the product discontinuation with an article date of 26 September 2025. The official cut-off date is 1 October 2025. From this date onwards, all Siemens SINUMERIK 840D sl HMI hardware carries the status P.M410. This marks the end of the possibility to order new devices or assemblies. Since then, all components have been available solely as spare parts. This affects panels, MCPs, NCUs, TCU units and the peripheral assemblies.

The discontinuation ends regular marketing. Companies must establish alternative supply strategies in order to keep their systems in operation. EICHLER plays a central role here. The service provider supplies tested spare parts and repairs defective Siemens assemblies down to component level. This enables older machines to remain economically stable in operation.

With milestone P.M410, the service phase begins. The theoretical spare parts commitment is ten years from P.M400. In practice, however, availability depends on remaining stock. Siemens continuously reduces inventory levels after the discontinuation. Accessories in the lower price range may already be assigns to P.M500 at an early stage. Manufacturer repair services are also reduced. Support for the SINUMERIK 840D sl ends definitively with the transition to P.M490.

 Companies therefore require additional strategies. EICHLER ensures spare part supply through tested components and repairs down to component level. The warranty of up to 36 months extends the safe use of the system well beyond the official life cycle.

The direct successor is the Siemens SINUMERIK ONE. It represents the new high-end platform. Siemens focuses on digital twins, shorter commissioning times, and significantly higher computing power. The migration takes place step by step: analysis of the existing 840D sl configuration, evaluation of compatible axis and drive technology, planning of HMI transitions, and definition of the new machine infrastructure. While the operating philosophy remains largely unchanged, machine builders will need to reconfigure control software, interfaces, and safety functions. EICHLER supports operators by repairing affected Siemens 840D sl assemblies, ensuring that the migration can be planned flexibly in terms of timing. This prevents investment pressure and reduces breakdown risks.

The Siemens SINUMERIK ONE sets new standards in performance, motion control, and engineering. Computing power, data processing, and integrated simulation significantly surpass the SINUMERIK 840D sl. The digital twin enables virtual commissioning. Safety functions have been modernised. The network architecture and field bus systems are more tightly integrated. The operator devices are based on modern touch technologies and higher resolution. At the same time, the basic operating logic remains compatible.

The Siemens SINUMERIK 840D sl HMI hardware is unable to support these functions due to hardware limitations. Therefore, Siemens focuses on the new platform. For operators, it is important to plan for the increased complexity. EICHLER assists in keeping the existing hardware economically viable until a full migration becomes useful.

A migration to Siemens SINUMERIK ONE requires a thorough analysis. First, axis, motors, and drives must be checked. Many Siemens components are compatible, but not all HMIs and peripheral devices. Software structures from existing SINUMERIK 840D sl projects need to be recompiled and validated. Additionally, safety functions and communication interfaces differ.

Adapting the user interface and machine visualisation requires engineering effort. Operators must realistically estimate the planned downtime. Parallel operation of old and new hardware can be useful. Repairs and spare parts supply by EICHLER create additional time reserves. This protects against unplanned costs and reduces migration pressure.

There are several critical points to consider when replacing individual Siemens SINUMERIK 840D sl HMI components. Panels require identical firmware versions. OEM-specific key layouts on MCPs must match exactly, as they are connected in a machine-dependent manner. TCU variants are often integrated into proprietary networks. NCUs require coordinated software versions for drives and PLCs. When replacing devices, all licences must be transferred correctly.

Siemens will only provide safety-critical updates for systems with status P.M410, and only to a limited extent. Further development has been discontinued. Firmware maintenance will be completely discontinued once P.M490 is reached. This applies to CNC, PLC, and HMI software versions.  Operators must therefore develop alternative strategies. Safe continued operation remains possible if existing systems are running stably and spare parts are reliably available.

EICHLER offers an extensive inventory of tested Siemens SINUMERIK 840D sl HMI assemblies. All devices are fully tested and come with up to a 36-month warranty. The online shop delivers fast availability. In addition, a wide range of refurbished panels, MCPs, NCUs, and peripheral modules is available. Companies benefit from clear prices and transparent conditions. Repairs at the component level also allow many devices to be completely restored. This ensures a high level of supply security even years after the product has been discontinued.

The formal life cycle ends with milestone P.M500. This status is set when no replacement parts are available and all support has been discontinued. As a rule, the Siemens SINUMERIK 840D sl reaches this point several years after the product discontinuation. In practice, this depends on the remaining stock. Individual accessories can be transferred to P.M500 at an early stage. EICHLER extends the actual life cycle far beyond the manufacturer's warranty period through repairs and tested replacement parts. This means that machines remain economically viable and do not have to be migrated prematurely.