Siemens Aktiengesellschaft

Ulrich Lehmann

Walter Kreb

Wilhelm Griesbaum

Robert Schwab

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

A module for a programmable controller includes a plurality of analog input channels, a control and evaluation device, and input terminals, where for each input channel, the module includes two analog to digital converters, at least four coupling elements and a switchover device, where for each input channel, where an input side of one analog to digital converter is directly or indirectly connected with the input terminals and an output side is connected with the evaluation circuit via a coupling element, where a control input of the switchover device is connected with the switching signal generator via a further coupling element, a signal output of the switchover device is connected with an input side of the other analog-to-digital converter, and where an output side of the other analog-to-digital converter is connected with the evaluation circuit via a further coupling element, where the coupling elements cause electrical isolation.

Analog input module

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.

Redundant control system having a peripheral unit for an automation device

A redundant control system having at least a first and a second control computer () and at least one peripheral unit () that is connected to the control computers () by a bus system (). Both control computers transmit cyclically changing signs of life (LzX, LzY) to the peripheral unit (), which checks whether a change in the signs life has taken place within a given time period and which switches to the other control computer for executing the control tasks if the change in the sign of life is not timely received.

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Wörth, Germany

Ulrich Lehmann