At present, the application of the programmable logic controller (PLC) in automation of industrial processes continues to have enormous opportunities due to its robustness and ease of programming control algorithms, it is also true that there is a shortage of teaching material in higher level schools in this area, usually because of the cost.This work describes the construction and control of a tank or experimental physical model of level and temperature by means of a PLC and the visualization of information in a Human Machine Interface (HMI), an experimental documentary methodology was used.A proportional control with PWM was applied in the PLC to control the variables, level and temperature tests were performed with and without water discharge in the tank.The results showed that the proportional control was sufficient to control the level and temperature of the tank with gain of 3 and 5 with an error 5 mm or 2% and 0.5 0 C or 1.56% with discharge respectively, the system is open so it can be applied and test the response under various types of control.

An edible coating or film is originated from natural products such as polysaccharides, proteins and lipids, with the addition of plasticizers and/or surfactants.Agar films are biodegradable, transparent, and heat-sealable edible films made from agar, a polysaccharide extracted from red algae.They are a potential alternative to plastic packaging, offering environmental benefits due to their renewable and biodegradable nature.However, pure agar films have drawbacks, such as brittleness and high moisture permeability, which can be addressed by incorporating other materials, like other polymers, besides plasticizers, and/or reinforcing them with nanomaterials.Agar--based edible films incorporated with fruit extracts offer a promising approach for sustainable food packaging and preservation, with the natural benefits of both materials.Agar, provides a biodegradable base for the films, while fruit extracts enhance functionality with antioxidants and other bioactive compounds.This combination addresses challenges like brittleness and low barrier properties inherent in agar alone, promoting a more sustainable and functional packaging solution.In the present article the challenges of the preparation of agar films incorporated of mulberries or blackberries, Morus genus or Rubus genus extracts are presented and discussed, taking in account the different factors that can modify film structure, such as irradiation, that can improve their functionality and applicability in foods.