Patent
1994-04-28
1995-05-23
Downs, Robert W.
395920, 395 68, G05B 1904
Patent
active
054188873
ABSTRACT:
A data processing apparatus includes a computer (1), a detector (2) for external events signalled on a set of input lines (7,8, etc.), and a real time clock 3. A table (20) of rules (24) is included in the computer storage (19). The computer is programmed to respond to a condition, (B,t) stored in a field (26,27) of a rule, being satisfied by generating an associated response (R) stored in a field (28) of that rule. The condition part of each rule requires the continous presence of a specific internal or external behavior (B) stored in the field 26 for a specific finite time (t) stored in the field 27 in order for the rule to be fired. Each time a change of internal behavior occurs due to the firing of a rule, and each time a change of external behavior occurs, signalled on one of the lines 7,8 etc., the rules are examined and the response associated with the next one to be fired on the basis of the behaviors currently present is loaded into a field (33) of a register (23), the time at which the firing is to occur (if there is no intermediate change of behavior which results in a new rule being potentially the next to be fired) being stored in a field 34. If the output of the clock (3) reaches the time stored in the field 34 the response indicated by the data in the field 33 is generated. This response may be purely internal, indicated by changing a flag associated with an entry (25) in a stored table (21), or external, taking the form of a signal on an output line (14,15, etc.).
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Connah David M.
Wavish Peter R.
Downs Robert W.
Slobod Jack D.
U.S. Philips Corporation
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