Failsafe data output system and automation system having the same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Nov 30, 2004
Grant Date -
N/A
app pub date -
Nov 7, 2000
filing date -
Jan 14, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
An apparatus for and a method of operating an automation system. A processing unit subjects useful information which is received via a telegram to a user designated logic operation and drives an output channel in accordance with a result of the logic operation. The processing unit monitors a time sequence of process data transmitted with the useful information and drives the output channel only when the time sequence lies within predetermined tolerances. A monitoring unit monitors the processing unit and shifts the output channel to a safe condition as soon as a malfunction of the processing unit is detected. The output channel may include a readback channel which reads back a signal applied to the output channel whereby the monitoring unit compares the applied signal and the readback signal and shifts the output channel to a safe state if the applied signal and the readback signal differ.
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