Siemens Aktiengesellschaft

Werner Blumenstock

Georg Biehler

Werner Agne

Reiner Plonka

Jochen Schlinkert

The objective is to reduce the downtime of a printing system in the printing industry. Provision is therefore made to supply the drive regulators () of a printing system () simultaneously with a plurality of clock signals. Each of the drive regulators () independently selects one of the clock signals for synchronization. In the event of failure of a signal source, the printing system is not interrupted but the drive regulators () switch automatically to the clock still present.

System comprising a plurality of slave devices coupled to a bidirectional ring bus and outputting a first and second clock signal from a first and second slave device respectively and selecting either the first or second clock signal at each slave device

A memory-programmable controller used, in particular, in a larger automation system and a method for operation of a memory-programmable controller (S -Sn). The memory programmable controller (S -Sn) is linked to a central computer (R) of the automation system over a network ( ). All of the user data ( ), application programs ( ), configuration data ( ) and the operating systems ( ) of the memory-programmable controller (S -Sn) are stored on a central computer. However, only working copies of the data are stored in the memory of the memory-programmable controller (S -Sn). In the case of a failure of the memory-programmable controller (S -Sn) or components therein, the user data ( ), application programs ( ), configuration data ( ) and/or the operating system ( ) are loaded in the memory of the memory-programmable controller from a central computer (R) by way of the network ( ). Because of this, updates to the operating system can be carried out centrally and very easily. In addition, in each case, the current versions of the application programs are available centrally and thus can be easily archived. Moreover, in the case of a malfunction, the required data can be loaded at any time, preferably automatically.

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Weisendorf, Germany

Werner Blumenstock