Design of an HMI in Web Server of PLC's S7-1200/1500 for the Control of a Multivariable Process of a Didactic Module. - Wilson Sánchez-Ocaña; Verónica Almache Barahona; Elizabeth Salazar Jácome; Washington Freire Llerena; Marcelo Silva Monteros (WorldCIST (2), 2018)