Siemens Aktiengellschaft

Andrea Ringler

Hartmut Schuetz

Manfred Mueller

Johann Schinnerl

A method for monitoring the output function of an output unit ( ). In particular, the output unit is a binary output unit of a safety-oriented programmable logic controller, which controls actuators ( ) of an external technical process. The output function of the output unit ( ) is monitored within a predetermined time interval by using bit patterns, which are produced by the external technical process, and by using bit patterns, which have not been transmitted by the output unit ( ) to the actuators ( ) of the external technical process. Therein, the number of output test bit patterns is reduced to a necessary minimum.

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Pegnitz, Germany

Andrea Ringler