Siemens Aktiengesellschaft

Joachim Hepp

Adrian Mucha

A field device which outputs a measured value and includes a self-diagnosis function which, when at least one specified error is detected, signals this error, marks the output measured value as temporarily invalid, and initiates the output of a substitute value that is used to trigger a safety-oriented response, where to prevent interventions when temporary errors occur, but without losing safety-relevant information, the field device includes a first and second timers having different expiration times that are started when the error is detected and are reset at the end of the detected error, where the first timer initiates the output of the substitute value when the first expiration time expires, where the second timer signals the error when the second expiration time expires, and where the signal is resettable if, at the same time, the output measured value is marked as valid via the second binary status signal.

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Karlsbad, Germany

Joachim Hepp