Diagnostic aid for industrial controller using multi-tasking architecture
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United States of America Patent
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Dec 1, 1998
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N/A
app pub date -
May 22, 1996
filing date -
Nov 1, 1995
priority date (Note) -
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Abstract
A task executed on a multi-tasking industrial controller is employed to monitor data exchanged between a control program (executed as a second task on the industrial controller) and the controlled process. The monitoring task, which may be invoked on a periodic basis, reads designated data, compares it to its last value and if it changes, stores the value in a buffer. A separate program reads this buffer and displays relevant information to the user minimizing degradation in the performance of the control program and eliminating the possibility of corruption of the control program as would be required for the introduction of special memory trapping instructions into the control program.
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