Diagnostic aid for industrial controller using multi-tasking arc

Details Diagnostic aid for industrial controller using multi-tasking arc Diagnostic aid for industrial controller using multi-tasking arc

1996-05-22

1998-12-01

Elmore, Reba I.

Boots, shoes, and leggings

364131, 364146, 36446805, 36446806, G05B 1942

Patent

active

058447954

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.

REFERENCES:
patent: 4172289 (1979-10-01), Struger et al.
patent: 5212631 (1993-05-01), Schmidt et al.
patent: 5400246 (1995-03-01), Wilson et al.
patent: 5404520 (1995-04-01), Sonobe
patent: 5485620 (1996-01-01), Sadre et al.
patent: 5530643 (1996-06-01), Hodorowski
patent: 5636124 (1997-06-01), Rischar et al.

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