Siemens Aktiengesellschaft

Walter Kreb

Ulrich Lehmann

Robert Schwab

Wilhelm Griesbaum

Hans-Günther Sieberling

Thomas Borger

Raimund Trockel

A circuit arrangement for generating a supply voltage with a controllable ground potential level includes a voltage source that provides the supply voltage ungrounded, a control unit that generates an adjustable control d.c. voltage to ground, and an operational amplifier that is connected via its voltage supply terminals to the supply voltage source, where the control d.c. voltage is applied to the inverting input of the operational amplifier, the non-inverting input of the operational amplifier is connected via a resistor network to the voltage source and to a ground terminal and the output of the operational amplifier is fed back to the inverting input via a capacitor.

Circuit arrangement for generating a supply voltage with controllable ground potential level

There is described a method for operating an automation system which comprises at least two measuring modules, each connected to a higher order processing unit in order to communicate therewith. The higher order processing unit is informed of an event that is recorded by one of the at least two measuring modules. The processing unit then informs any available measuring module of the event.

Method for operating an automation system

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.

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Schwanheim, Germany

Walter Kreb