Field device for a processing plant and method for supplying the field device

A field device for a processing plant, comprising:

• an electrical input to which an electrical power supply is connected, an electronic unit for processing a process signal, and an input circuit connected between the electrical input and the electronic unit for limiting a supply voltage fed to the electronic unit;
• the input circuit comprising a power management circuit comprising a storage unit for electric energy and a power requirement acquisition unit for at least one of determining and receiving a required power level necessary for processing the process signal by the electronic unit;
• the power management circuit charging into the electrical storage unit an amount of electrical energy of the power supply connected to the input circuit that exceeds the current required power level;
• the input circuit comprising a comparison unit for comparing the required power level with an actual power level supplied to the electrical input;
• and
• the comparison unit being fitted with an electrical resistor, an electronic component for detecting a voltage drop across the resistor, and a load switch connected with the electronic component, the load switch having a passive switching status in which an electrical connection between the storage unit and the electrical input is interrupted, and an active switching status in which the electrical connection between the storage unit and the electrical input is closed for charging the storage unit.

A field device for a processing plant, comprising:

• an electrical input to which an electrical power supply is connected, an electronic unit for processing a process signal, and an input circuit connected between the electrical input and the electronic unit for limiting a supply voltage fed to the electronic unit;
• the input circuit comprising a power management circuit comprising a storage unit for electric energy and a power requirement acquisition unit for at least one of determining and receiving a required power level necessary for processing the process signal by the electronic unit;
• the power management circuit charging into the electrical storage unit an amount of electrical energy of the power supply connected to the input circuit that exceeds the current required power level;
• and
• the power management circuit having a voltage-current converter connected downstream to the storage unit and adapts current intensity by altering the supply voltage in dependence on a power consumption of the field device to be supplied by the storage unit.

A field device for a processing plant, comprising:

• an electrical input to which an electrical power supply is connected, an electronic unit for processing a process signal from the electrical input, and an input circuit connected between the electrical input and the electronic unit for limiting a supply voltage fed to the electronic unit;
• the input circuit comprising a power management circuit comprising a storage unit for electric energy and a power requirement acquisition unit for at least one of determining and receiving a current required power level necessary for processing the process signal by the electronic unit;
• the power management circuit charging into the electrical storage unit an amount of electrical energy of the power supply connected to the input circuit that exceeds the current required power level;
• and
• the power management circuit being designed to close via a connecting circuit pre-determined individual switches of the electronic unit in case of failure of the electrical power supply or an undersupply of power to the field device.

A field device for a processing plant, comprising:

• an electrical input to which an electrical power supply is connected, an electronic unit for processing a process signal from the electrical input, and an input circuit connected between the electrical input and the electronic unit for limiting a supply voltage fed to the electronic unit;
• the input circuit comprising a power management circuit comprising a storage unit for electrical energy and a power requirement acquisition unit for obtaining a current required power level necessary for processing the process signal by the electronic unit;
• and
• the power management circuit charging into the electrical storage unit an amount of electrical energy of the power supply connected to the input circuit that exceeds the required current power level and supplying stored energy from the electrical storage unit to the electronic unit when necessary.