Abstract: The invention relates to a method for monitoring an electrical heating apparatus and to a corresponding apparatus. The electrical heating apparatus has at least one heating element. A measured value, which is dependent on the resistance and/or the inductance of the electrical heating element, is measured, the measurement being carried out by means of the measured value being sampled. Owing to the use of sampled values, the measurement process can be shortened.

Abstract: A system for automating the control and regulation of machines and systems in the plastics industry, in particular for blow molding machines, having programmable logic controllers (PLC), via which control and regulation functions of the machines and systems can be implemented as desired. The programmable logic controllers (PLC) have at least one operating and monitoring device and a local bus (user platform), and are further provided with digital technology blocks (10) which simulate individual electric circuit components and which can be used to implement the desired control and regulation functions in a modular fashion. The digital technology blocks (10) are connected to one another and to the user platform via data interfaces.