Abstract: An electric control and protection system for an output channel of automation equipment, the output channel being capable of controlling an electrical load as a function of a control signal from the automation equipment, the control and protection system including: a device that switches the electrical load including an MOS switching transistor, a source of the MOS switching transistor being connected to a positive voltage terminal via a resistor and a drain of the MOS switching transistor being connected to the electrical load, the MOS switching transistor being switchable between an on-state in which the electrical load is connected to the resistor and an off-state.

Abstract: The invention relates to an electronic control and protection system for an output channel of automation equipment. It comprises: i) a device for switching (10) an electrical load (C) comprising an MOS switching transistor (T5), the source of which is connected to a positive voltage terminal (P) via a resistor (R5) and the drain of which is connected to the load (C), the transistor (T5) being switchable between an on-state in which the load (C) is connected to said resistor (R5) and an off-state; ii) a limiting device (20) limiting the voltage at the terminals of said resistor (R5) to a predetermined maximum value (VR5max); iii) an output channel cut-off device (30) able to switch the transistor (T5) to the off-state when the current flowing through said resistor (R5) passes a predetermined threshold for a predetermined duration.

Abstract: An input or input-output management circuit for a process control system such as a programmable automation is provided, including a serializing means with parallel inputs connected to input channels by filtering and threshold means, a series output of the serializing means being connected via a series connection equipped with an optocoupler and a filter to an input or input-output management unit.