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US 7,512,727 B2Granted
Redundant control system having a peripheral unit for an automation device
AssigneeSiemens Aktiengesellschaft
InventorsWalter Kreb, Ulrich Lehmann, Robert Schwab
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Abstract
There is described a periphery unit for an automatic device, which can be actuated as an analog input and as an analog output. A number of connections which are to be used as inputs and the number of connections which are to be used as outputs can be adapted in a flexible manner on the respective application from a predetermined number of connections of the periphery unit. As a result, a redundant automatic device wherein said types of periphery units can be used, is provided.
Claims9
A peripheral unit for an automation device, comprising:
- a first terminal;
- a second terminal;
- a supply unit;
- a digital-to-analog converter;
- a control unit to switch the supply unit to a first and to a second setting wherein:
- in the first setting the digital-to-analog converter is controlled by the control unit at a constant value to apply a constant voltage to the first terminal, and
- in the second setting the digital-to-analog converter is controlled by the control unit at a value corresponding to a required process output signal at the first terminal;
- and
- an analog-to-digital converter to convert an applied current inputted via the first terminal in the first setting, wherein the analog-to-digital converter applies a process input signal to the control unit based upon the measured applied current which is measured via a measuring circuit.
6 more elements
A redundant control system, comprising:
- a peripheral unit for an automation device, having:
- a first terminal;
- a second terminal;
- a supply unit;
- a digital-to-analog converter;
- a control unit to switch the supply unit to a first and to a second setting wherein:
- in the first setting the digital-to-analog converter is controlled by the control unit at a constant value to apply a constant voltage to the first terminal, and
- in the second setting the digital-to-analog converter is controlled by the control unit at a value corresponding to a required process output signal at the first terminal;
- and
- an analog-to-digital converter to convert an applied current inputted via the first terminal in the first setting, wherein the analog-to-digital converter applies a process input signal to the control unit based upon the measured applied current which is measured via a measuring circuit;
- and
- an actor having a first actor terminal and a second actor terminal;
- wherein the first actor terminal is connected to the first terminal, and wherein the second actor terminal is connected to a terminal that is provided with a frame potential of the peripheral unit.
10 more elements
A redundant control system, comprising:
- a peripheral unit for an automation device, having:
- a first terminal;
- a second terminal;
- a supply unit;
- a digital-to-analog converter;
- a control unit to switch the supply unit to a first and to a second setting wherein:
- in the first setting the digital-to-analog converter is controlled by the control unit at a constant value to apply a constant voltage to the first terminal,
- in the second setting the digital-to-analog converter is controlled by the control unit at a value corresponding to a required process output signal at the first terminal,
- an analog-to-digital converter to convert an applied current inputted via the first terminal in the first setting, wherein the analog-to-digital converter applies a process input signal to the control unit based upon the measured applied current which is measured via a measuring circuit;
- and
- a measuring transducer having a first measuring transducer terminal and a second measuring transducer terminal, wherein the first measuring transducer terminal is connected to the first terminal, and wherein the second measuring transducer terminal is connected to the second terminal and the second measuring circuit.
8 more elements
Dependencies are inferred from the claim text.