Estudo da comunicação acíclica dentro de uma rede industrial utilizando Profibus PA

Abstract

In recent years it has been observed that the instrumentation and automation markets have been demanding field equipment such as pressure and temperature transmitters converters positioning actuators and controllers among others with high performance reliability availability etc., with the intention of obtaining better results such as minimizing power consumption, reducing process variability reducing operating and maintenance costs as well as ensuring optimization. With this advance in the demand of high performance field equipment and the consolidation of industrial networks the project proposal is the implementation of open standards protocol tools to access data and make the parameterization and configuration of field equipment (transmitters and sensors) in order to obtain a maintenance plan for the equipment and to analyze the influence that these tools can have on the network due to over supervision and information carried on the network. For this, two complete monitoring and control systems were assembled using an open field equipment maintenance system using Profibus technology. The first system used the Prosoft Compact Logix card controller communicating with four field instruments, supervision using the Elipse SCADA system and maintenance system using the Pactware software. The second system consisted of a controller DF95 using the same four field instruments, ProcessView supervision system and ProfibusView maintenance station. With the aid of a line listening tool, all message packets exchanged between all devices were captured, as well as the respective network times. With this it was possible to make a deep study on the Profibus network, besides analyzing the performance of the cyclic and acyclic communication between these two systems. The results showed that supervision does not present a significant change in scan times and the inclusion of new devices in the network is practically linear. It was also possible to notice better performance of Compact Logix controller compared to DF95.