Warehouse control system: The digital nerve centre of automated warehouse logistics

A look behind the scenes of automated warehouses reveals that the process involves more than just moving goods around; it is also about the intelligent integration of data, processes and hardware. Smart sensors, scanners, barcodes, RFID tags and cameras are used to collect thousands of data points from stationary and mobile equipment, which are then analysed in real time by networked systems. This requires innovative software solutions, collectively known as WxS, which are precisely tailored to each project in order to seamlessly manage the various levels of the warehouse execution system (WES), warehouse management system (WMS) and warehouse control system (WCS).

In addition to the WMS, which is primarily responsible for warehouse and stock management, the WCS plays a particularly important role within the various software layers. This 'pacesetter' of automated material flows plans routes, identifies faulty items, prevents collisions and orchestrates interaction between stationary and mobile equipment. It thus enables precise just-in-time production supply. “A modern WCS is the digital nerve centre of automated warehouse logistics. It orchestrates the interaction between conveyor systems, robotics and people in real time," explains Johannes Funke, Team Lead Sales & Engineering Automated Intralogistics Solutions at STILL. The WCS receives orders from various sources, such as the WMS, and translates them into specific control commands for the different hardware components. In this way, the WCS synchronises processes to ensure smooth operations and optimised, efficient material flow, laying the foundation for high throughput and consistent quality. However, if the WCS is not correctly sized, requirements are not clearly defined, or no WCS has been implemented, automation projects can quickly encounter difficulties. 

Therefore, companies are well advised to pay close attention to the control of their automated material flows and to incorporate this into project planning from an early stage. The integration of flexible and scalable control software should form part of the project tender and the selection of a suitable partner. Identifying the necessary and appropriate control levels for each individual case is part of the analysis and consultancy provided by a professional partner. This depends on the system's complexity, the volume of material flows, and the specific requirements regarding throughput, transparency, and error handling. As a general rule, however, the more flexible, the better. After all, automation is dynamic. Many companies start by automating individual sub-processes and then gradually increase their level of automation. And even if AGV fleets can operate in stand-alone mode without a dedicated WCS, such a system becomes necessary when an additional hardware component is integrated into the material flow that cannot be controlled via the fleet controller. This is because automated systems generate thousands of data points in milliseconds: shuttle systems send several hundred status and location updates per transport order, while AGV fleets constantly exchange location data via their central control system. Without a WCS, the very errors, bottlenecks and downtime that process automation is intended to prevent occur.

The situation becomes even more challenging when systems from different manufacturers are required to interact. In such cases, in addition to a WMS and a WCS, a control system capable of orchestrating fleets from different manufacturers using standardised communication is also needed. For this purpose, so-called master fleet controllers are often used; these typically utilise the VDA 5050 communication standard to synchronise the various components. However, even these master fleet controllers can reach their limits as complexity and the associated flood of data increase. Therefore, it is advisable to use flexible, scalable software solutions from the outset that can adapt to individual requirements. "Scalability is a decisive criterion for many companies when choosing the right software solution. And for good reason: control software tailored to individual customer needs enables ever-greater integration of processes and paves the way for the gradual automation of material flows," explains Michael Malik, Head of Intralogistics Solutions, STILL Germany.

Today’s market offers a wide range of concepts and technical solutions for WxS systems, from stand-alone to cross-system and fully integrated solutions such as STILL iGo flow, which combine several control levels within a single system, reducing its overall complexity. Although opting for an integrated solution means phasing out existing systems and stand-alone solutions, the benefits of automation outweigh the drawbacks: fewer interfaces for data transfer and communication, as well as greater transparency thanks to a central database, enable efficient control of warehouse and material flow processes. Errors and malfunctions can be responded to more quickly, and adjustments can be implemented more easily. This means that an integrated solution is easier to scale than automation systems comprising various individual systems. They can be expanded without difficulty to grow in line with the customer’s level of automation. In addition to simplifying the overall system, this is a significant advantage for many companies given the dynamic developments in automation technology. Furthermore, the convergence of WES, WCS and WMS reduces the number of systems and partner companies involved. This reduces implementation and maintenance effort, simplifies matters for the project team and shortens decision-making and coordination processes, ultimately lowering overall costs.