APPLICATION OF IEC 61499 STANDARD FOR THE DESIGN OF A DISTRIBUTED CONTROL SYSTEM FOR MANUFACTURING PARTICLEBOARDS

Abstract

The appearance of the first distributed control systems is associated with the widespread use of digital automation in the control system. The IEC 61499 architecture was conceived in anticipation of the demand for distributed automation. It incorporates several solutions facing distributed automation challenges. It can be said that IEC 61499 proposes a system level design language for distributed measurement and control systems, thus bridging the gap between the popular PLC programming languages and distributed systems. According to the IEC 61499 model, a distributed system consists of computer devices equipped with interfaces to the environment, such as communication networks or physical machinery and processes. The universal design artefact of the IEC 61499 architecture is function block (FB). Function blocks can be used for describing decentralized control logic, but also for describing properties of devices, such as their interfaces. To combine several function blocks into an application, they are connected by event and data connection arcs. Thus, the complete functionality of distributed control system can be represented in terms of function blocks and connections between them. The analysis of the technological scheme of production of particleboard was conducted. Particleboard or chipboard is manufactured by mixing wood particles or flakes together with a resin and forming the mixture into a sheet. The particles are then dried, and any oversized or undersized particles are screened out. Resin is then sprayed as a fine mist onto the particles. After the particles pass through a mist of resin sufficient to coat all surfaces, they are layered into a continuous carpet. The formed sheets are compressed under pressures between 2 and 3 megapascals (290 and 440 psi) and temperatures between 140 and 220 °C (284 and 428 °F) to set and harden the glue. The entire process is controlled to ensure the correct size, density and consistency of the board. On the basis of the conducted analysis, a management structure with the use of functional blocks of IEC 61499 standard has been proposed. Execution Control Chart (ЕСС) of the press control unit for the formation of particleboard has been developed.