Diseño y construcción de un acoplamiento electrónico para realizar conexiones de IoT en un PLC convencional

The growth of the digital industrial technology (Industry 4.0) is a revolution that makes it possible to gather, control and analyze data about several technical procedures. The result of this manufacturing revolution is the higher-quality products being produced at a lower cost. It is becoming increasingly difficult to ignore the role that Internet of Things (IoT) has in the productive processes, however, this technology is expensive and requires an update of the Programmable Logic Controllers (PLCs). This paper will focus on the update of the design and construction of an electronic coupling device to make IoT connections in a conventional PLC. In this work a siemens S7-200 PLC is used, in the inputs and outputs of this device a nodemcu esp32 WIFI card is coupled to monitor and control the process. The electronic circuit and the flow diagram of the coupling between the PLC and WIFI card are included. The evidence from this study suggests that the upgrade of the industrial equipment towards the industry 4.0 is possible without the need to make significant changes.