Automation technology autarkic field device
AssigneeEndress + Hauser Process Solutions AG
InventorsChristian Seiler, Dirk Rapp
Life of this patent
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Abstract
An automation technology, autarkic, field device, which is connected via two connecting terminals to an I/O module. The I/O module is embodied as a 4-20 mA/HART I/O module. The I/O module is associated with a controllable energy source via which the field device is supplied with energy. An electrical current measuring unit is provided which ascertains the electrical current supplied by the energy source. In the I/O module, internal resistors are provided, across which occurs in each case a voltage drop dependent on the flowing electrical current. A control unit is provided, which operates the energy source in such a way that a predetermined terminal voltage is supplied on the connecting terminals for powering the field device.
Claims14
An automation technology, autarkic, field device connected via two connecting terminals to an I/O module;
- wherein the I/O module is embodied as a 4-20 mA/HART I/O module, comprising:
- a controllable energy source, via which the field device is supplied with energy;
- an electrical current measuring unit, which ascertains electrical current supplied by said controllable energy source;
- internal resistors across which occurs in each case a voltage drop dependent on electrical current;
- and
- a control unit, which operates said controllable energy source in such a way that a predetermined terminal voltage is supplied to the connecting terminals for powering the field device, wherein:
- said control unit operates said controllable energy source in such a way that it dynamically so controls the terminal voltage as a function of the electrical current flowing in each case, that, at minimum energy consumption, correct operation of the field device is assured at all times.
Dependencies are inferred from the claim text.