Method and apparatus for analyzing and recording downtime of a manufacturing process

A method for analyzing downtime of a network of programmable logic controllers and other microprocessor based devices controlling a manufacturing process, said method operating in an operator interface module and comprising:

• a. setting an alarm priority level for each of a plurality of alarms signals;
• b. receiving a plurality of alarms from said network of programmable logic controllers and other microprocessor based devices indicating a start of a downtime event;
• c. starting an elapsed timer for recording total length of time of said downtime event;
• d. selecting one of said plurality of received alarms as a cause of said downtime event based on said alarm priority level of each of said received alarms;
• e. incrementing by one, one of a plurality of incident counters, said one incident counter assigned to said selected alarm, and said increment counter for recording total number of times said alarm caused said downtime incident;
• f. adding total length of time of said downtime event to one of a plurality of elapsed downtime registers, said one elapsed downtime register assigned to said selected alarm, and said elapsed downtime register for recording total elapsed downtime said alarm caused said downtime incident;
• g. generating a downtime incident summary table from said plurality of incident counters, said summary table listing a predetermined number of said alarms and identifying said alarm by an alarm number, said generation of said downtime summary table further including sorting said alarms in descending order based on said total number of times said alarm caused downtime incidents;
• h. generating a downtime summary table from said plurality of elapsed downtime registers, said summary table listing a predetermined number of said alarms and identifying said alarm by an alarm number, said generation of said downtime summary table further including sorting said alarms in descending order based on said total elapsed downtime when said alarm caused downtime incidents;
• i. displaying a portion of said downtime incident summary table in bar chart form, said display indicating said alarm number and its respective total number of downtime incidents, said display in descending order based on said downtime incidents;
• and
• j. displaying a portion of said downtime summary table in bar chart form, said display indicating said alarm number and its respective total elapsed downtime, said display in descending order based on said total elapsed downtime.