Control electronics for a process device and method for operation therefor
AssigneeEndress + Hauser Wetzer GmbH + Co. KG
InventorsRoberto Lugli, Michael Korn
Life of this patent
Estimating the term…
Abstract
Control electronics for a two-wire process device, which two-wire process device can be connected to a two-wire loop. The control electronics comprises an input circuit and a control unit connected to the input circuit, wherein the input circuit is used in a first operating mode to set a current and/or voltage in the two-wire loop by means of a control signal transmitted by the control unit. The input circuit is used in a second operating mode to automatically, in particular independently of the control unit or independently of the control signal transmitted by the control unit, to set the current and/or the electric voltage in the two-wire loop.
Claims18
A control electronics for a two-wire process device, which two-wire process device can be connected to a two-wire loop, comprising:
- an input circuit, comprising an actuating element and a monitoring unit;
- and a control unit connected to said input circuit, wherein:
- said input circuit is used, in a first operating mode, to set a current and/or a voltage in said two-wire loop and/or to obtain the current and/or the electric voltage from the two-wire loop, by means of a control signal transmitted by said control unit;
- said input circuit is used, in a second operating mode, to set the current and/or the electric voltage in said two-wire loop and/or to obtain the current and/or the electric voltage from the two-wire loop, automatically, independently of said control unit or independently of the control signal transmitted by said control unit;
- said actuating element is used for setting the current and/or voltage in the two-wire loop;
- said monitoring unit is used for receiving said control signal from said control unit, and/or
- said control unit is electrically connected at least in the first operating mode, to said actuating element via said monitoring unit.
A process device, of process automation technology having control electronics, for a two-wire process device, which can be connected to a two-wire loop wherein:
- said control electronics comprising:
- an input circuit which comprises an actuating element and a monitoring unit;
- and a control unit connected to said input circuit, wherein:
- said input circuit is used, in a first operating mode, to set a current and/or a voltage in the two-wire loop and/or to obtain the current and/or the electric voltage from the two-wire loop, by means of a control signal transmitted by said control unit;
- said input circuit is used, in a second operating mode, to set the current and/or the electric voltage in the two-wire loop and/or to obtain the current and/or the electric voltage from the two-wire loop, automatically, independently of said control unit or independently of the control signal transmitted by said control unit;
- said actuating element is used for setting the current and/or voltage in the two-wire loop;
- said monitoring unit is used for receiving said control signal from said control unit, and/or
- said control unit is electrically connected at least in the first operating mode, to said actuating element via said monitoring unit.
A method of operating a process device of process automation technology having a control electronics for said process device, which two-wire process device can be connected to a two-wire loop, wherein the control electronics comprise an input circuit, which comprises an actuating element and a monitoring unit, and a control unit connected to said input circuit,
- wherein the input circuit is used, in a first operating mode, to set a current and/or a voltage in the two-wire loop and/or to obtain the current and/or the electric voltage from the two-wire loop, by means of a control signal transmitted by the control unit,
- wherein the input circuit is used, in a second operating mode, to set the current and/or the electric voltage in the two-wire loop and/or to obtain the current and/or the electric voltage from the two-wire loop, automatically, independently of the control unit or independently of the control signal transmitted by the control unit,
- said actuating element is used for setting the current and/or voltage in the two-wire loop;
- said monitoring unit is used for receiving said control signal from said control unit, and/or
- said control unit is electrically connected at least in the first operating mode, to said actuating element via said monitoring unit,
- comprising the steps of:
- setting or obtaining in the first operating mode, by means of said control signal transmitted by said control unit, the current and/or voltage in or from said two-wire loop by means of said input circuit;
- and automatically setting or obtaining in the second operating mode, the current and/or the electric voltage by means of said input circuit in or from said two-wire loop.
Dependencies are inferred from the claim text.