Siemens Aktiengesellschaft

Siemens Aktiengesell Schaft

Valentin Kort

Michael Abert

Eberhard Schlarb

Arnold Klamm

Michael Cyron

Dirk Marenski

An automation device having a plurality of modules, where at least one first module is configured to supply the other modules electrical power and a second module is configured to determine the total power requirement of the automation device, wherein the second module determines the total power requirement from the information relating to the power requirement of the respective module, which information is stored in the other modules, and compares the total power requirement with a threshold value and initiates measures for reducing the power requirement of at least one of the other modules based on the comparison result to prevent an overload due to improper or inappropriate installation of the automation device in a switchgear cabinet and resultant reduced air convection.

Automation device

A bus interface unit is provided for intermediate switching in a two-wire current loop, wherein the bus interface unit has a transformer for potential-free decoupling of an alternating current signal modulated with digital receive data and/or for coupling in of an alternating current signal to be modulated with digital send data. The alternating current signal is modulated onto a direct current signal of a two-wire current loop. The bus interface unit has a bidirectional modem unit connected on the secondary side to the transformer for output of the receive data on a data bus and for input of the send data from the data bus. The transformer has two primary windings, which are interconnected such that the magnetic fields generated by the two-wire loop current flowing through it cancel each other out. A lowpass and/or a highpass filter for the alternating current signal is connected upstream from the at least one primary winding.

Bus interface unit for interposing in a two-wire current loop, as well as a transducer, position controller and analog input and output module with such a bus interface unit

A power supply device has an input for an AC input voltage or for a DC input voltage and an output for a load-dependent DC output voltage electrically isolated therefrom. A step-up converter is connected to the input side, a charging coil, a first switching element, a freewheeling diode, a charging capacitor and means for regulating the voltage of a converter DC input voltage are provided on the output side at the step-up converter unit by a pulse-width-modulated activation of the first switching element. The power supply device has a switched-mode DC/DC converter connected to the step-up converter unit, a second switching element with a transformer for electrical isolation, and means for closed-loop controlled predefined, load-dependent voltage reduction of the DC output voltage by pulse-width-modulated activation. The second switching element is controlled by a constant converter pulse duty factor. The first switching element is controlled by a converter pulse duty factor such that the converter DC input voltage decreases with increasing load.

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Landau, Germany

Valentin Kort