Siemens Aktiengesellschaft

Richard Freitag

Arquimedes Martinez Canedo

Mohammad Abdullah Al Faruque

Erwin Flierl

Siegfried Neumann

Erich Zerbian

Paul Froehlich

Mitchell Packer

Hans-Joachim Jaehne

A method of identifying and extracting functional parallelism from a PLC program has been developed that results in the ability of the extracted program fragments to be executed in parallel across a plurality of separate resources, and a compiler configured to perform the functional parallelism (i.e., identification and extraction processes) and perform the scheduling of the separate fragments within a given set of resources. The inventive functional parallelism creates a larger number of separable elements than was possible with prior dataflow analysis methodologies.

Parallelization of PLC programs for operation in multi-processor environments

A contactor safety combination includes two contactors and a mechanical interlocking module coupled between them. It is possible to use conventional contactors of any size, i.e., even high-capacity loads are switchable with the contactor safety combination of the present invention. At the same time, this design approach dispenses with a third contactor conventionally used for the interlocking.

Contactor safety interlock mechanism

A monitoring device having a switching mechanism to open or close electric circuits in case of overload which operates as a function of a current-detecting device includes a processor and setpoint memories for comparing and evaluating actual values. A device for detecting additional load operational errors, statistical operating data, and maintenance instructions from at least the load current over the lifetime of the device and providing a run display to display this data are consecutively integrated into the monitoring device. Furthermore, input keys are provided for setting desired parameters, which can be displayed in the run display.

Monitoring device with a switching mechanism

Growing community of inventors

Munich, Germany

Richard Freitag