Field device

Patent metadata

Field	Value
Publication number	US-9904347-B2
Application number	US-201414328235-A
Country	US
Kind code	B2
Filing date	Jul 10, 2014
Priority date	Jul 24, 2013
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

A field device with a microprocessor and a display and/or operating module, which can be disconnected from the field device, with the microprocessor showing an energy saving module, in which the display and/or operating module are switched off, with the waking circuit being provided, which generates a waking signal when the display and/or operating module are disconnected from the field device or connected thereto.

First claim

We claim:

1. A field device with a microprocessor and a display and/or operating module that can be disconnected from the field device, wherein the microprocessor controls the field device as well as the display and/or operating module, the microprocessor comprises an energy saving mode in which the display and/or operating module is switched off, wherein an energy supply of the display and/or operating module is interrupted during a transition by the microprocessor to the energy saving mode, further comprising a waking circuit which generates a waking signal when the display and/or operating module is connected to the field device, wherein the waking circuit comprises a comparator, a reference voltage and a measuring voltage are supplied to the comparator, the waking circuit comprises a measuring circuit at which the measuring voltage can be tapped, and connecting the display and/or operating module leads to a change of the measuring voltage that causes the generation of the waking signal by the comparator and wherein the measuring circuit is embodied as a second voltage splitter showing a serial circuit comprising a third resistance and a fourth resistance, with the third resistance and the fourth resistance being sized such that in a parallel connection of the fourth resistance and the switched-off display and operating modules the measuring voltage is equivalent to the reference voltage.

2. The field device of claim 1 , wherein the waking signal is generated when the measuring voltage is higher than the reference voltage.

3. The field device of claim 1 , wherein the waking circuit comprises a first voltage splitter with a serial connection comprising a first resistance, connected to a supply voltage, and a second resistance, connected to a ground potential at which the reference voltage can be tapped.

4. The field device of claim 3 , wherein the first voltage splitter and/or the second voltage splitter are sized such that a current of less than 5 μA flows through both voltage splitters.

5. The field device of claim 1 , wherein the third resistance and the first resistance are equally sized.

6. The field device of claim 1 , further comprising wherein a parallel connection of the fourth resistance to the display and/or operating module is equivalent to the second resistance.

7. The field device of claim 1 , wherein the waking signal is supplied to an interrupt input of the microprocessor.

8. The field device of claim 7 , wherein the waking signal wakes the microprocessor from a deep energy saving mode in which the processor clock and the processor interfaces have been deactivated.

9. The field device of claim 1 , wherein the third resistance is switched parallel in reference to a first switch, which interrupts an energy supply of the display and/or operating module in the energy saving mode.

10. The field device of claim 1 , further comprising wherein a second switch is arranged between the fourth resistance and the ground potential, which in the energy saving mode connects the fourth resistance to the ground potential.

11. The field device of claim 1 , wherein the waking signal is a simple port-interrupt, used without any system clock and activation of respective interfaces of any micro controllers.

Assignees

• Grieshaber Vega Kg

Inventors

• Allgaier Volker
• Staiger Holger

Classifications

• G06F1/3278

  Power saving in modem or I/O interface · CPC title

• G06F1/1654

  the display being detachable, e.g. for remote use · CPC title

• G06F1/3237

  by disabling clock generation or distribution · CPC title

• G06F1/3265 Primary

  Power saving in display device · CPC title

• G06F1/3287 Primary

  by switching off individual functional units in the computer system · CPC title