Implementing a Manufacturing Execution System (MES) represents a far-reaching intervention in existing production and organizational structures. For an MES to deliver its full intended value, business processes and workflows must be clearly defined, scoped, and aligned in advance. As part of a project to introduce an MES for fuel cell production, the structured development of these business processes was therefore the central focus. The objective was to establish a robust process foundation from which both functional and technical system requirements could be derived.
Structured Project Launch with a Clear Process Map
The first step involved facilitating and coordinating an interdisciplinary project team. Representatives from production planning, manufacturing, quality, logistics, and IT contributed their perspectives to develop a shared understanding of the future process landscape.
On this basis, a process map was created that provides a clear overview of all core and supporting processes and makes their interdependencies transparent. This map served as the guiding framework for all subsequent detailed work.
Process Scoping Using the SIPOC Method
To capture the processes clearly and completely, systematic scoping was carried out using the SIPOC method. This approach ensures that suppliers, process steps, outputs, and customers are unambiguously defined.
The SIPOC analysis was particularly valuable in making interfaces between departments transparent and establishing clear accountability. At the same time, initial requirements relating to data flows and system integration became visible at an early stage.
Process Modeling According to BPMN Standards
The scoped processes were subsequently modeled in detail using the Business Process Model and Notation (BPMN) methodology. The business process modeling was conducted in a way that allows both operational and technical stakeholders to follow and understand the workflows. Particular attention was given to the consistent representation of roles, decision points, exceptions, and interfaces.
The modeled processes included, among others:
- Production planning and order management
- Operational manufacturing workflows
- Quality assurance and inspection processes
- Logistics processes and material provisioning
- Interlinking systems and fault management
The uniform BPMN structure resulted in transparent, reusable process documentation applicable across the organization.
Identification of Quality and Efficiency Drivers
In parallel with the modeling work, quality and efficiency drivers were identified that the MES is specifically intended to support. These included, for example, real-time data availability, full traceability, transparency of disruptions, and the reduction of manual interventions.
These drivers fed directly into the definition of system requirements and formed an important basis for the subsequent evaluation of MES value and return on investment.
Definition of MES System Requirements and Interfaces
From the modeled processes, the concrete requirements for the MES were derived. In addition to functional requirements, the focus was placed on the precise definition of system interfaces. Requirements were defined in particular for integration with Microsoft Dynamics NAV (Navision) as the leading ERP system, and with HydraX as the production and automation platform.
Furthermore, parameters for the design of machine interfaces were specified to enable consistent and standardized connectivity of all production equipment.
Reference Processes and Validation Preparation
A further component of the project was the definition of reference processes to be used later for MES validation. These reference processes describe typical and critical production scenarios and serve as the benchmark for verifying system functionality.
In addition, normative requirements and relevant documentation obligations were integrated into the processes, ensuring that regulatory specifications are already embedded in the system design from the outset.
Result: A Solid Process Foundation for MES Implementation
The project delivered a clearly structured and consistently documented process landscape that fully captures all relevant production and supporting processes. The modeled workflows provide a transparent description of operational processes that is comprehensible to both business and technical stakeholders. Clear process scoping using the SIPOC method ensured that responsibilities, interfaces, and process boundaries were unambiguously defined.
On this foundation, the requirements for integrating the MES with existing ERP and automation systems could be precisely derived. Reference processes were defined to serve as the benchmark for system testing and validation. The resulting requirements specifications provide a reliable basis for system selection and ensure that functional, technical, and organizational requirements are comprehensively addressed.
Overall, a stable starting point has been established for structuring, implementing, and sustainably operating the MES in a targeted manner.
Conclusion
Successful MES implementation does not begin with software; it begins with processes. Only through rigorous process scoping, structured BPMN modeling, and the clear derivation of system requirements does an MES project achieve realistic value and broad organizational acceptance. The approach described here demonstrates how process design, methodology, and project management work together to implement digitalization in production effectively and sustainably.