Monitoring and control system and method

Details Monitoring and control system and method Monitoring and control system and method

1993-10-19

1997-07-01

Gordon, Paul P.

Boots, shoes, and leggings

364147, 364192, G05B 1101

Patent

active

056444877

ABSTRACT:
In a distributed process-control system, program-controlled apparatus is provided for permitting an operator to control the mode of a Sequential Function Chart (SFC) to place the Chart in any of five different modes as a convenience in monitoring, editing and/or changing the SFC program. These modes are: OFF mode, for temporarily disabling operation of the SFC Chart, an AUTO mode which allows the SFC program and Chart to run as configured, a HOLD mode which freezes the chart in its current state, a MANUAL mode enabling the operator to force the Chart to an operator-selected step while the output of the current step is maintained active, and a TRACE mode enabling the operator to view the steps in the Chart sequentially, and to force the steps without executing them.

REFERENCES:
patent: 5168441 (1992-12-01), Onarheim et al.
patent: 5198990 (1993-03-01), Farzan et al.
patent: 5291389 (1994-03-01), Iwata
patent: 5327546 (1994-07-01), Yokoi et al.
patent: 5392207 (1995-02-01), Wilson et al.
Moore Information Bulletin P139-3, Issue 1 pp. 1-13, Mar. 1993.
Control Engineering Article "A DCS-PLC Combination Puts Functions Into Modules", pp. 36-37, Aug. 1992.

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