Industrial Automatic Control Systems and Controllers Annotation << Back Application of Programmable Logic Controllers in Autonomous Marine Surface Vessels Sedova N.A., Sedov V.A., Bazhenov R.I. This article examines the development of control algorithms for autonomous marine surface vessels (MANS) using programmable logic controllers (PLCs). Particular attention is paid to the implementation of software solutions in the PC WorX environment, which supports various programming languages (FBD, LD, ST, SCL) optimal for specific tasks. Examples of algorithm development are presented: course correction based on gyroscopic compass data using the Structured Text programming language, diesel generator control to optimize fuel consumption, engine control during berth approaches, and route adjustment based on weather data. For each case, the structure of the software solutions, key variables, algorithm logic, and integration methods with vessel automation systems are described. Prospects for improving PLC software, including the implementation of artificial intelligence systems and protocol standardization, are discussed. Overall, the article emphasizes the importance of developing reliable, flexible, and scalable software algorithms to enhance the autonomy and safety of MANS. Keywords: programmable logic controller, autonomous vessels, marine control systems, shipping automation, industrial controllers. DOI: 10.25791/asu.11.2025.1621 Pp. 07-13.