I couldn’t find a direct PDF download link for "Autómatas Programables" by Josep Balcells and José Luis Romeral (the full title is usually Autómatas Programables: Entorno y Aplicaciones ). However, here is the of that well-known Spanish textbook on PLCs (Programmable Logic Controllers), so you know what it covers if you’re searching for it.
: Instructions on configuration, setup, and various programming languages used in the industry.
: Understanding how a PLC actually "thinks" in real-time.