Andon

Andon is a visual management and early warning system rooted in lean manufacturing and the Toyota Production System (TPS). As part of the jidoka principle, Andon makes problems on the production line immediately visible, enabling rapid intervention. The word “Andon” means “light” or “lamp” in Japanese and serves as a communication tool in modern production environments, equipped with colored signal lights and audible alarms.

Technical Operation and Components:

Andon systems typically consist of light signal towers (stack lights) and manual or automatic triggers. The color coding of the lights is generally as follows:

• Green: The system is operating normally; no intervention is required.
• Yellow: A potential issue exists, requiring attention but production has not stopped.
• Red: A critical error or stoppage has occurred; immediate intervention is necessary.

In recent years, the flexibility and ease of installation of Andon systems have been enhanced through wireless technologies such as Z-Wave, Wi-Fi, and Bluetooth. These technologies enable rapid communication across different levels and remote locations of the production line.

Role and Importance in Lean Manufacturing:

Lean manufacturing aims to eliminate activities that do not create value. In this context, Andon prevents time losses and defects arising from faulty production. Problems emerging during the production process become immediately visible, minimizing downtime. As a result, costs decrease while production quality and customer satisfaction increase. Furthermore, by encouraging operator and employee involvement in the process, Andon supports ownership and continuous improvement in workplace culture (Liker, 2004).

Evolution with Industry 4.0 and Digitalization:

While traditional Andon systems rely on simple visual and auditory alerts, today they are increasingly integrated with IoT (Internet of Things) technologies that enable more complex data collection and analysis. Wireless sensors, real-time data streams, and AI-powered analytics allow for the early detection of anomalies in production processes and the implementation of predictive maintenance. This digital transformation enables Andon to evolve from a mere problem-reporting system into a proactive decision-support system.

Industry Applications:

In the apparel and textile industry especially, Andon is widely used on individual sewing machines and cutting machines. Here, the system manages not only production stoppages but also maintenance needs and quality inspections. Visible lights and audible alarms, even from long distances, enhance factory-wide coordination and boost operator motivation.

Critical Evaluation and Limitations:

Although Andon systems are a vital component of lean manufacturing philosophy, their success largely depends on organizational culture and the training level of employees. If the system is misused or if workers trigger the stop button unnecessarily, unnecessary disruptions to production flow may occur. Additionally, in environments lacking adequate technological infrastructure, wireless communication issues may arise. Therefore, the design and integration of Andon systems require balanced management of both technical and cultural factors.

Andon can be described as the visual intelligence of lean manufacturing. It is indispensable for reducing waste and enhancing quality control processes. With digitalization, Andon systems are becoming smarter and more predictive, and will occupy a central role in decision-making within future production facilities.